Tektronix Keithley 2651A User manual

Reference Manual
2651A-901-01 Rev. C October 2021
*P2651A-901-01C*
2651A-901-01C
tek.com/keithley
Model 2651A High Power
System SourceMeter Instrument

High Power System SourceMeter®Instrument
Reference Manual
Model 2651A

© 2021, Keithley Instruments, LLC
Cleveland, Ohio, U.S.A.
All rights reserved.
Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part,
without the prior written approval of Keithley Instruments, LLC, is strictly prohibited.
These are the original instructions in English.
TSPTM, TSP-LinkTM, and TSP-NetTM are trademarks of Keithley Instruments, LLC. All Keithley
Instruments product names are trademarks or registered trademarks of Keithley Instruments, LLC.
Other brand names are trademarks or registered trademarks of their respective holders.
The Lua 5.0 software and associated documentation files are copyright © 1994 - 2015, Lua.org,
PUC-Rio. You can access terms of license for the Lua software and associated documentation at
the Lua licensing site (https://www.lua.org/license.html).
Microsoft, Visual C++, Excel, and Windows are either registered trademarks or trademarks of
Microsoft Corporation in the United States and/or other countries.
Document number: 2651A-901-01 Rev. C October 2021

Safety precautions
The following safety precautions should be observed before using this product and any associated instrumentation. Although
some instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous
conditions may be present.
This product is intended for use by personnel who recognize shock hazards and are familiar with the safety precautions required
to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using the
product. Refer to the user documentation for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the
equipment is operated within its specifications and operating limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the
instrument. They must be protected from electric shock and contact with hazardous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the line
voltage or replacing consumable materials. Maintenance procedures are described in the user documentation. The procedures
explicitly state if the operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, perform safe installations, and repair products. Only properly trained
service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are measurement, control, and data I/O connections, with low
transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high transient
overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient
overvoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected to
mains. These instruments will be marked as category II or higher.
Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test
fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than
30 V RMS, 42.4 V peak, or 60 VDC are present. A good safety practice is to expect that hazardous voltage is present in any
unknown circuit before measuring.
Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators
are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators in these circumstances must be trained to protect themselves from the risk of electric shock. If
the circuit is capable of operating at or above 1000 V, no conductive part of the circuit may be exposed.
Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance-limited
sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective
devices to limit fault current and voltage to the card.
Before operating an instrument, ensure that the line cord is connected to a properly-grounded power receptacle. Inspect the
connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.
When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input
power disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under
test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting
cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.
Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth)
ground. Always make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the
voltage being measured.

For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or
accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be
impaired.
Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the
specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.
When fuses are used in a product, replace with the same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as protective earth (safety ground)
connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use
of a lid interlock.
If a screw is present, connect it to protective earth (safety ground) using the wire recommended in the user documentation.
The symbol on an instrument means caution, risk of hazard. The user must refer to the operating instructions located in the
user documentation in all cases where the symbol is marked on the instrument.
The symbol on an instrument means warning, risk of electric shock. Use standard safety precautions to avoid personal
contact with these voltages.
The symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.
The symbol indicates a connection terminal to the equipment frame.
If this symbol is on a product, it indicates that mercury is present in the display lamp. Please note that the lamp must be
properly disposed of according to federal, state, and local laws.
The WARNING heading in the user documentation explains hazards that might result in personal injury or death. Always read
the associated information very carefully before performing the indicated procedure.
The CAUTION heading in the user documentation explains hazards that could damage the instrument. Such damage may
invalidate the warranty.
The CAUTION heading with the symbol in the user documentation explains hazards that could result in moderate or minor
injury or damage the instrument. Always read the associated information very carefully before performing the indicated
procedure. Damage to the instrument may invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits —including the power
transformer, test leads, and input jacks —must be purchased from Keithley. Standard fuses with applicable national safety
approvals may be used if the rating and type are the same. The detachable mains power cord provided with the instrument may
only be replaced with a similarly rated power cord. Other components that are not safety-related may be purchased from other
suppliers as long as they are equivalent to the original component (note that selected parts should be purchased only through
Keithley to maintain accuracy and functionality of the product). If you are unsure about the applicability of a replacement
component, call a Keithley office for information.
Unless otherwise noted in product-specific literature, Keithley instruments are designed to operate indoors only, in the following
environment: Altitude at or below 2,000 m (6,562 ft); temperature 0 °C to 50 °C (32 °F to 122 °F); and pollution degree 1 or 2.
To clean an instrument, use a cloth dampened with deionized water or mild, water-based cleaner. Clean the exterior of the
instrument only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that
consist of a circuit board with no case or chassis (e.g., a data acquisition board for installation into a computer) should never
require cleaning if handled according to instructions. If the board becomes contaminated and operation is affected, the board
should be returned to the factory for proper cleaning/servicing.
Safety precaution revision as of June 2017.

Introduction..............................................................................................................1-1
Welcome .............................................................................................................................. 1-1
Extended warranty ............................................................................................................... 1-1
Contact information.............................................................................................................. 1-1
Customer documentation..................................................................................................... 1-2
Organization of manual sections...............................................................................................1-2
Capabilities and features...................................................................................................... 1-3
Model-specific capabilities ................................................................................................... 1-4
General information.............................................................................................................. 1-4
Displaying the serial number.....................................................................................................1-4
General operation ....................................................................................................2-1
General ratings..................................................................................................................... 2-1
Controls, indicators, and connectors.................................................................................... 2-2
Front panel................................................................................................................................2-2
Rear panel.................................................................................................................................2-6
Cooling vents ....................................................................................................................... 2-8
Starting up your instrument.................................................................................................. 2-9
Procedure..................................................................................................................................2-9
Placing the Model 2651A in standby.......................................................................................2-10
Warmup period........................................................................................................................2-10
Line frequency configuration...................................................................................................2-10
Fuse replacement ...................................................................................................................2-11
System information ............................................................................................................ 2-11
Menu overview................................................................................................................... 2-11
Menu navigation......................................................................................................................2-11
Menu trees..............................................................................................................................2-13
Setting values.......................................................................................................................... 2-16
Beeper................................................................................................................................ 2-18
Display mode ..................................................................................................................... 2-19
Basic operation .................................................................................................................. 2-19
Operation overview.................................................................................................................2-19
Operation considerations for the ADC.....................................................................................2-25
Basic source-measure procedure ...........................................................................................2-27
Triggering in local mode..........................................................................................................2-30
Configuring trigger attributes in local mode.............................................................................2-31
Configuring for measure-only tests using the MODE key........................................................2-32
Voltmeter and ammeter measurements..................................................................................2-33
Ohms measurements.............................................................................................................. 2-34
Power measurements.............................................................................................................2-37
Contact check measurements.................................................................................................2-40
Saved setups ..........................................................................................................................2-42
DUT test connections......................................................................................................... 2-45
Input/output connectors...........................................................................................................2-45
2-wire local sensing connections.............................................................................................2-47
Table of contents

Table of contents Model 2651A High Power System SourceMeter® Instrument Reference Manual
4-wire remote sensing connections.........................................................................................2-48
Contact check connections .....................................................................................................2-49
Multiple SMU connections.......................................................................................................2-50
Combining SMU outputs .........................................................................................................2-51
Guarding and shielding ...........................................................................................................2-57
Test fixture ..............................................................................................................................2-62
Floating a SMU .......................................................................................................................2-63
DUT connection settings.................................................................................................... 2-64
Sense mode selection.............................................................................................................2-64
Output-off states......................................................................................................................2-65
USB storage overview........................................................................................................ 2-69
Connecting the USB flash drive ..............................................................................................2-70
File system navigation.............................................................................................................2-70
Displayed error and status messages................................................................................ 2-71
Range................................................................................................................................. 2-71
Available ranges...................................................................................................................... 2-72
Maximum source values and readings.................................................................................... 2-72
Measure autodelay..................................................................................................................2-73
Ranging limitations..................................................................................................................2-73
Manual ranging .......................................................................................................................2-73
Autoranging.............................................................................................................................2-74
Low range limits......................................................................................................................2-74
Range considerations .............................................................................................................2-75
Range programming ...............................................................................................................2-76
Digits .................................................................................................................................. 2-77
Setting display resolution from the front panel ........................................................................2-77
Setting display resolution from a remote interface ..................................................................2-77
Speed................................................................................................................................. 2-78
Setting the speed from the front panel ....................................................................................2-78
Setting the speed using the remote interface..........................................................................2-79
Remote communications interfaces................................................................................... 2-80
Supported remote interfaces...................................................................................................2-80
Output queue ..........................................................................................................................2-81
LAN communications..............................................................................................................2-81
GPIB operation........................................................................................................................2-83
General bus commands..........................................................................................................2-86
Front-panel GPIB operation ....................................................................................................2-88
RS-232 interface operation .....................................................................................................2-90
Functions and features............................................................................................3-1
Relative offset ...................................................................................................................... 3-1
Enabling and disabling relative offset from the front panel........................................................3-1
Defining a relative offset value from the front panel..................................................................3-2
Relative offset commands.........................................................................................................3-2
Filters.................................................................................................................................... 3-3
Filter types.................................................................................................................................3-3
Response time..........................................................................................................................3-4
Enabling the filter from the front panel ......................................................................................3-4
Configuring the filter from the front panel..................................................................................3-5
Setting the filter using a remote interface..................................................................................3-5
Reading buffers.................................................................................................................... 3-6
Front-panel reading buffer control.............................................................................................3-6
Remote reading buffer programming ......................................................................................3-11

Model 2651A High Power System SourceMeter® Instrument Reference Manual Table of contents
Sweep operation ................................................................................................................ 3-21
Sweep characteristics.............................................................................................................3-23
Configuring and running sweeps.............................................................................................3-31
Sweeping using factory scripts................................................................................................3-33
Sweep programming examples...............................................................................................3-34
Triggering........................................................................................................................... 3-36
Remote triggering overview..................................................................................................... 3-36
Using the remote trigger model...............................................................................................3-38
SMU event detectors...............................................................................................................3-42
Using trigger events to start actions on trigger objects............................................................3-44
Digital I/O port and TSP-Link synchronization lines ................................................................3-45
Timers.....................................................................................................................................3-48
Event blenders........................................................................................................................3-57
LAN triggering overview..........................................................................................................3-58
Command interface triggering.................................................................................................3-60
Manual triggering ....................................................................................................................3-60
Interactive triggering................................................................................................................3-61
Hardware trigger modes..........................................................................................................3-65
Understanding synchronous triggering modes........................................................................3-69
High-capacitance mode ..................................................................................................... 3-73
Understanding high-capacitance mode...................................................................................3-73
Enabling high-capacitance mode............................................................................................ 3-76
Display operations.............................................................................................................. 3-79
Display functions and attributes ..............................................................................................3-79
Display features ......................................................................................................................3-79
Display messages...................................................................................................................3-81
Input prompting.......................................................................................................................3-85
Indicators.................................................................................................................................3-87
Local lockout........................................................................................................................... 3-88
Load test menu .......................................................................................................................3-88
Running a test from the front panel.........................................................................................3-90
Key-press codes .....................................................................................................................3-90
Digital I/O ........................................................................................................................... 3-92
Port configuration.................................................................................................................... 3-92
Digital I/O configuration........................................................................................................... 3-94
Controlling digital I/O lines.......................................................................................................3-94
Using output enable ................................................................................................................3-96
Interlock...................................................................................................................................3-98
TSP-Link trigger lines..............................................................................................................3-98
Theory of operation ................................................................................................. 4-1
Analog-to-digital converter................................................................................................... 4-1
Source-measure concepts................................................................................................... 4-2
Limit principles ..........................................................................................................................4-2
Overheating protection..............................................................................................................4-3
Operating boundaries................................................................................................................4-5
Basic circuit configurations......................................................................................................4-20
Guard......................................................................................................................................4-24
Cable considerations...............................................................................................................4-26
Measurement settling time considerations......................................................................... 4-27
Programming example for controlling settling time delay........................................................4-28
Effects of load on current source settling time................................................................... 4-28
Creating pulses with the Model 2651A SMU ..................................................................... 4-29

Table of contents Model 2651A High Power System SourceMeter® Instrument Reference Manual
Pulse rise and fall times..........................................................................................................4-29
Pulse width..............................................................................................................................4-30
Remote commands..................................................................................................5-1
Introduction to TSP operation .............................................................................................. 5-1
Controlling the instrument by sending individual command messages .....................................5-1
Queries .....................................................................................................................................5-3
Information on scripting and programming................................................................................5-3
About TSP commands......................................................................................................... 5-4
Beeper control...........................................................................................................................5-4
Bit manipulation and logic operations........................................................................................5-4
Data queue................................................................................................................................5-5
Digital I/O ..................................................................................................................................5-5
Display ......................................................................................................................................5-6
Error queue............................................................................................................................... 5-7
Event log...................................................................................................................................5-7
File I/O ......................................................................................................................................5-7
GPIB .........................................................................................................................................5-8
Instrument identification ............................................................................................................5-9
LAN and LXI..............................................................................................................................5-9
Miscellaneous .........................................................................................................................5-10
Parallel script execution ..........................................................................................................5-11
Queries and response messages............................................................................................ 5-11
Reading buffer.........................................................................................................................5-12
Reset.......................................................................................................................................5-12
RS-232....................................................................................................................................5-13
Saved setups ..........................................................................................................................5-13
Scripting..................................................................................................................................5-13
SMU........................................................................................................................................5-14
SMU calibration.......................................................................................................................5-15
Status model...........................................................................................................................5-16
Time........................................................................................................................................5-17
Triggering................................................................................................................................5-17
TSP-Link .................................................................................................................................5-19
TSP-Net ..................................................................................................................................5-20
Userstrings..............................................................................................................................5-20
Factory scripts.................................................................................................................... 5-21
Running a factory script ..........................................................................................................5-21
Retrieving and modifying a factory script listing ......................................................................5-22
KISweep factory script ............................................................................................................5-22
KIPulse factory script ..............................................................................................................5-23
KIHighC factory script .............................................................................................................5-24
KIParlib factory script ..............................................................................................................5-25
KISavebuffer factory script......................................................................................................5-25
Instrument programming......................................................................................... 6-1
Fundamentals of scripting for TSP....................................................................................... 6-1
What is a script?........................................................................................................................6-2
Runtime and nonvolatile memory storage of scripts..................................................................6-2
What can be included in scripts?...............................................................................................6-3
Commands that cannot be used in scripts................................................................................6-3
Manage scripts..........................................................................................................................6-3
Working with scripts in nonvolatile memory.............................................................................6-11
Programming example: Interactive script................................................................................6-13
Fundamentals of programming for TSP............................................................................. 6-15
What is Lua?........................................................................................................................... 6-15

Model 2651A High Power System SourceMeter® Instrument Reference Manual Table of contents
Lua basics...............................................................................................................................6-15
Standard libraries.................................................................................................................... 6-30
Script with a for loop................................................................................................................6-34
Test Script Builder.............................................................................................................. 6-34
Installing the TSB software......................................................................................................6-35
Using Test Script Builder (TSB) ..............................................................................................6-35
Project navigator.....................................................................................................................6-36
Script editor.............................................................................................................................6-37
Outline view.............................................................................................................................6-37
Programming interaction.........................................................................................................6-38
Working with TSB Embedded............................................................................................ 6-39
Send individual instrument commands with TSB Embedded..................................................6-40
Password management ..................................................................................................... 6-41
Setting the password from a command or web interface ........................................................ 6-42
Unlocking the remote interface................................................................................................6-43
Resetting the password...........................................................................................................6-43
Advanced scripting for TSP ............................................................................................... 6-44
Global variables and the script.user.scripts table....................................................................6-44
Create a script using the script.new() command .....................................................................6-45
Rename a script......................................................................................................................6-48
Retrieve a user script ..............................................................................................................6-50
Delete user scripts from the instrument...................................................................................6-52
Restore a script to the runtime environment ...........................................................................6-53
Memory considerations for the runtime environment ..............................................................6-53
TSP-Link system expansion interface................................................................................ 6-55
Master and subordinates......................................................................................................... 6-55
TSP-Link system.....................................................................................................................6-56
TSP-Link nodes.......................................................................................................................6-56
Connections............................................................................................................................6-57
Initialization .............................................................................................................................6-57
Resetting the TSP-Link network..............................................................................................6-58
Accessing nodes.....................................................................................................................6-59
Using the reset() command.....................................................................................................6-60
Using the abort command.......................................................................................................6-60
Triggering with TSP-Link......................................................................................................... 6-60
TSP advanced features...........................................................................................................6-61
Using groups to manage nodes on TSP-Link network............................................................6-64
Running simultaneous test scripts........................................................................................... 6-65
Using the data queue for real-time communication.................................................................6-67
Copying test scripts across the TSP-Link network..................................................................6-67
Removing stale values from the reading buffer cache ............................................................6-67
TSP-Net ............................................................................................................................. 6-68
TSP-Net capabilities................................................................................................................6-68
Using TSP-Net with any ethernet-enabled instrument ............................................................ 6-69
TSP-Net compared to TSP-Link to communicate with TSP-enabled devices.........................6-71
TSP-Net instrument commands: General device control ........................................................6-71
TSP-Net instrument commands: TSP-enabled device control ................................................6-71
Example: Using tspnet commands..........................................................................................6-72
TSP command reference.........................................................................................7-1
TSP command programming notes ..................................................................................... 7-1
Placeholder text ........................................................................................................................7-1
Syntax rules ..............................................................................................................................7-2
Time and date values................................................................................................................7-2
Remote versus local state......................................................................................................... 7-3

Table of contents Model 2651A High Power System SourceMeter® Instrument Reference Manual
Using the TSP command reference..................................................................................... 7-3
Command name and summary table........................................................................................7-4
Command usage.......................................................................................................................7-5
Command details......................................................................................................................7-6
Example section........................................................................................................................7-6
Related commands and information..........................................................................................7-7
TSP commands.................................................................................................................... 7-7
beeper.beep()............................................................................................................................7-7
beeper.enable...........................................................................................................................7-8
bit.bitand()................................................................................................................................. 7-8
bit.bitor()....................................................................................................................................7-9
bit.bitxor()................................................................................................................................7-10
bit.clear().................................................................................................................................7-11
bit.get()....................................................................................................................................7-12
bit.getfield() .............................................................................................................................7-13
bit.set()....................................................................................................................................7-14
bit.setfield()..............................................................................................................................7-15
bit.test()...................................................................................................................................7-16
bit.toggle()............................................................................................................................... 7-17
bufferVar.appendmode ...........................................................................................................7-18
bufferVar.basetimestamp........................................................................................................7-19
bufferVar.cachemode..............................................................................................................7-20
bufferVar.capacity...................................................................................................................7-21
bufferVar.clear()......................................................................................................................7-22
bufferVar.clearcache().............................................................................................................7-22
bufferVar.collectsourcevalues.................................................................................................7-23
bufferVar.collecttimestamps....................................................................................................7-24
bufferVar.fillcount....................................................................................................................7-25
bufferVar.fillmode....................................................................................................................7-26
bufferVar.measurefunctions.................................................................................................... 7-27
bufferVar.measureranges .......................................................................................................7-28
bufferVar.n ..............................................................................................................................7-29
bufferVar.readings...................................................................................................................7-30
bufferVar.sourcefunctions .......................................................................................................7-31
bufferVar.sourceoutputstates..................................................................................................7-32
bufferVar.sourceranges...........................................................................................................7-33
bufferVar.sourcevalues ...........................................................................................................7-34
bufferVar.statuses...................................................................................................................7-35
bufferVar.timestampresolution ................................................................................................7-36
bufferVar.timestamps..............................................................................................................7-37
ConfigPulseIMeasureV().........................................................................................................7-38
ConfigPulseIMeasureVSweepLin() .........................................................................................7-40
ConfigPulseIMeasureVSweepLog()........................................................................................7-42
ConfigPulseVMeasureI().........................................................................................................7-44
ConfigPulseVMeasureISweepLin() .........................................................................................7-47
ConfigPulseVMeasureISweepLog()........................................................................................7-49
dataqueue.add()......................................................................................................................7-51
dataqueue.CAPACITY............................................................................................................7-52
dataqueue.clear()....................................................................................................................7-53
dataqueue.count .....................................................................................................................7-54
dataqueue.next()..................................................................................................................... 7-55
delay().....................................................................................................................................7-57
digio.readbit()..........................................................................................................................7-58
digio.readport()........................................................................................................................7-59
digio.trigger[N].assert()............................................................................................................7-60
digio.trigger[N].clear()..............................................................................................................7-60
digio.trigger[N].EVENT_ID ......................................................................................................7-61
digio.trigger[N].mode...............................................................................................................7-62
digio.trigger[N].overrun............................................................................................................7-63
digio.trigger[N].pulsewidth.......................................................................................................7-64

Model 2651A High Power System SourceMeter® Instrument Reference Manual Table of contents
digio.trigger[N].release().......................................................................................................... 7-65
digio.trigger[N].reset() .............................................................................................................7-65
digio.trigger[N].stimulus........................................................................................................... 7-66
digio.trigger[N].wait()...............................................................................................................7-68
digio.writebit()..........................................................................................................................7-69
digio.writeport() .......................................................................................................................7-70
digio.writeprotect.....................................................................................................................7-71
display.clear()..........................................................................................................................7-71
display.getannunciators()........................................................................................................7-72
display.getcursor()...................................................................................................................7-74
display.getlastkey() .................................................................................................................7-75
display.gettext().......................................................................................................................7-76
display.inputvalue().................................................................................................................7-78
display.loadmenu.add()........................................................................................................... 7-79
display.loadmenu.catalog() .....................................................................................................7-81
display.loadmenu.delete().......................................................................................................7-82
display.locallockout.................................................................................................................7-83
display.menu().........................................................................................................................7-84
display.numpad.......................................................................................................................7-85
display.prompt() ......................................................................................................................7-85
display.screen.........................................................................................................................7-87
display.sendkey()....................................................................................................................7-87
display.setcursor()...................................................................................................................7-89
display.settext().......................................................................................................................7-90
display.smuX.digits .................................................................................................................7-91
display.smuX.limit.func............................................................................................................7-92
display.smuX.measure.func....................................................................................................7-93
display.trigger.clear()...............................................................................................................7-94
display.trigger.EVENT_ID .......................................................................................................7-94
display.trigger.overrun.............................................................................................................7-95
display.trigger.wait()................................................................................................................7-95
display.waitkey()......................................................................................................................7-96
errorqueue.clear() ...................................................................................................................7-98
errorqueue.count.....................................................................................................................7-98
errorqueue.next() ....................................................................................................................7-99
eventlog.all()..........................................................................................................................7-100
eventlog.clear() .....................................................................................................................7-101
eventlog.count.......................................................................................................................7-101
eventlog.enable.....................................................................................................................7-102
eventlog.next() ......................................................................................................................7-102
eventlog.overwritemethod.....................................................................................................7-103
exit()......................................................................................................................................7-104
fileVar:close()........................................................................................................................7-104
fileVar:flush().........................................................................................................................7-105
fileVar:read() .........................................................................................................................7-107
fileVar:seek().........................................................................................................................7-108
fileVar:write().........................................................................................................................7-110
format.asciiprecision .............................................................................................................7-111
format.byteorder....................................................................................................................7-112
format.data............................................................................................................................7-113
fs.chdir()................................................................................................................................7-114
fs.cwd() ................................................................................................................................. 7-115
fs.is_dir() ...............................................................................................................................7-116
fs.is_file()...............................................................................................................................7-117
fs.mkdir()...............................................................................................................................7-118
fs.readdir().............................................................................................................................7-119
fs.rmdir()................................................................................................................................7-120
gettimezone()........................................................................................................................7-121
gm_isweep()..........................................................................................................................7-122
gm_vsweep().........................................................................................................................7-123
gpib.address..........................................................................................................................7-124

Table of contents Model 2651A High Power System SourceMeter® Instrument Reference Manual
i_leakage_measure() ............................................................................................................7-125
i_leakage_threshold()............................................................................................................7-126
InitiatePulseTest().................................................................................................................7-128
io.close()................................................................................................................................7-129
io.flush() ................................................................................................................................7-130
io.input()................................................................................................................................7-131
io.open()................................................................................................................................7-132
io.output()..............................................................................................................................7-133
io.read().................................................................................................................................7-134
io.type().................................................................................................................................7-135
io.write() ................................................................................................................................7-136
lan.applysettings().................................................................................................................7-138
lan.autoconnect.....................................................................................................................7-139
lan.config.dns.address[N]......................................................................................................7-140
lan.config.dns.domain...........................................................................................................7-141
lan.config.dns.dynamic..........................................................................................................7-142
lan.config.dns.hostname .......................................................................................................7-143
lan.config.dns.verify ..............................................................................................................7-144
lan.config.duplex...................................................................................................................7-144
lan.config.gateway ................................................................................................................7-145
lan.config.ipaddress..............................................................................................................7-146
lan.config.method..................................................................................................................7-147
lan.config.speed....................................................................................................................7-148
lan.config.subnetmask ..........................................................................................................7-149
lan.linktimeout.......................................................................................................................7-149
lan.lxidomain.........................................................................................................................7-150
lan.nagle................................................................................................................................7-151
lan.reset()..............................................................................................................................7-151
lan.restoredefaults()..............................................................................................................7-152
lan.status.dns.address[N]......................................................................................................7-153
lan.status.dns.name..............................................................................................................7-154
lan.status.duplex...................................................................................................................7-155
lan.status.gateway ................................................................................................................7-155
lan.status.ipaddress..............................................................................................................7-156
lan.status.macaddress ..........................................................................................................7-156
lan.status.port.dst..................................................................................................................7-157
lan.status.port.rawsocket ......................................................................................................7-157
lan.status.port.telnet..............................................................................................................7-158
lan.status.port.vxi11..............................................................................................................7-158
lan.status.speed....................................................................................................................7-159
lan.status.subnetmask ..........................................................................................................7-159
lan.timedwait.........................................................................................................................7-160
lan.trigger[N].assert() ............................................................................................................7-161
lan.trigger[N].clear() ..............................................................................................................7-161
lan.trigger[N].connect()..........................................................................................................7-162
lan.trigger[N].connected........................................................................................................7-163
lan.trigger[N].disconnect().....................................................................................................7-164
lan.trigger[N].EVENT_ID.......................................................................................................7-164
lan.trigger[N].ipaddress.........................................................................................................7-165
lan.trigger[N].mode................................................................................................................7-166
lan.trigger[N].overrun ............................................................................................................7-167
lan.trigger[N].protocol............................................................................................................7-168
lan.trigger[N].pseudostate.....................................................................................................7-169
lan.trigger[N].stimulus ...........................................................................................................7-170
lan.trigger[N].wait()................................................................................................................7-171
localnode.autolinefreq...........................................................................................................7-172
localnode.description ............................................................................................................7-173
localnode.license...................................................................................................................7-174
localnode.linefreq..................................................................................................................7-174
localnode.model....................................................................................................................7-175
localnode.password ..............................................................................................................7-175

Model 2651A High Power System SourceMeter® Instrument Reference Manual Table of contents
localnode.passwordmode .....................................................................................................7-176
localnode.prompts.................................................................................................................7-177
localnode.prompts4882......................................................................................................... 7-178
localnode.reset() ...................................................................................................................7-179
localnode.revision .................................................................................................................7-180
localnode.serialno.................................................................................................................7-180
localnode.showerrors............................................................................................................7-181
makegetter()..........................................................................................................................7-182
makesetter()..........................................................................................................................7-183
meminfo()..............................................................................................................................7-184
node[N].execute()..................................................................................................................7-185
node[N].getglobal()................................................................................................................7-186
node[N].setglobal()................................................................................................................7-187
opc()......................................................................................................................................7-188
os.remove()...........................................................................................................................7-188
os.rename()...........................................................................................................................7-189
os.time()................................................................................................................................7-189
print().....................................................................................................................................7-190
printbuffer()............................................................................................................................7-191
printnumber().........................................................................................................................7-192
PulseIMeasureV() .................................................................................................................7-193
PulseVMeasureI() .................................................................................................................7-194
QueryPulseConfig()...............................................................................................................7-195
reset()....................................................................................................................................7-197
savebuffer()...........................................................................................................................7-198
script.anonymous..................................................................................................................7-199
script.delete() ........................................................................................................................7-200
script.factory.catalog()...........................................................................................................7-200
script.load() ...........................................................................................................................7-201
script.new()............................................................................................................................7-202
script.newautorun() ...............................................................................................................7-203
script.restore().......................................................................................................................7-204
script.run().............................................................................................................................7-204
script.user.catalog()...............................................................................................................7-205
scriptVar.autorun...................................................................................................................7-206
scriptVar.list()........................................................................................................................7-207
scriptVar.name......................................................................................................................7-208
scriptVar.run() .......................................................................................................................7-209
scriptVar.save().....................................................................................................................7-210
scriptVar.source....................................................................................................................7-211
serial.baud.............................................................................................................................7-212
serial.databits........................................................................................................................7-213
serial.flowcontrol ...................................................................................................................7-214
serial.parity............................................................................................................................7-215
serial.read()...........................................................................................................................7-216
serial.write()...........................................................................................................................7-217
settime()................................................................................................................................7-218
settimezone() ........................................................................................................................7-219
setup.poweron.......................................................................................................................7-220
setup.recall() .........................................................................................................................7-221
setup.save() ..........................................................................................................................7-222
smuX.abort() .........................................................................................................................7-223
smua.buffer.getstats()...........................................................................................................7-223
smuX.buffer.recalculatestats()...............................................................................................7-225
smuX.cal.adjustdate..............................................................................................................7-226
smuX.cal.date .......................................................................................................................7-227
smuX.cal.due ........................................................................................................................7-228
smuX.cal.fastadc() ................................................................................................................7-229
smuX.cal.lock()......................................................................................................................7-230
smuX.cal.password...............................................................................................................7-231
smuX.cal.polarity...................................................................................................................7-232

Table of contents Model 2651A High Power System SourceMeter® Instrument Reference Manual
smuX.cal.restore().................................................................................................................7-233
smuX.cal.save() ....................................................................................................................7-234
smuX.cal.state.......................................................................................................................7-235
smuX.cal.unlock()..................................................................................................................7-236
smuX.contact.calibratehi().....................................................................................................7-236
smuX.contact.calibratelo().....................................................................................................7-238
smuX.contact.check()............................................................................................................7-239
smuX.contact.r()....................................................................................................................7-240
smuX.contact.speed..............................................................................................................7-241
smuX.contact.threshold.........................................................................................................7-242
smuX.makebuffer()................................................................................................................7-243
smuX.measure.adc...............................................................................................................7-243
smuX.measure.autorangeY...................................................................................................7-244
smuX.measure.autozero.......................................................................................................7-245
smuX.measure.calibrateY()...................................................................................................7-246
smuX.measure.count............................................................................................................7-247
smuX.measure.delay ............................................................................................................7-248
smuX.measure.delayfactor....................................................................................................7-249
smuX.measure.filter.count.....................................................................................................7-250
smuX.measure.filter.enable...................................................................................................7-251
smuX.measure.filter.type ......................................................................................................7-252
smua.measure.highcrangedelayfactor..................................................................................7-253
smuX.measure.interval .........................................................................................................7-254
smuX.measure.lowrangeY....................................................................................................7-255
smuX.measure.nplc ..............................................................................................................7-256
smua.measure.overlappedY()...............................................................................................7-257
smuX.measure.rangeY .........................................................................................................7-258
smua.measure.rel.enableY ...................................................................................................7-259
smua.measure.rel.levelY.......................................................................................................7-260
smuX.measure.Y()................................................................................................................7-261
smuX.measureYandstep().....................................................................................................7-262
smuX.nvbufferY.....................................................................................................................7-263
smuX.reset()..........................................................................................................................7-264
smuX.savebuffer().................................................................................................................7-265
smuX.sense ..........................................................................................................................7-266
smuX.source.autorangeY......................................................................................................7-267
smuX.source.calibrateY()......................................................................................................7-268
smuX.source.compliance......................................................................................................7-269
smuX.source.delay................................................................................................................7-270
smuX.source.func .................................................................................................................7-271
smuX.source.highc................................................................................................................7-271
smuX.source.levelY ..............................................................................................................7-272
smuX.source.limitY ...............................................................................................................7-273
smuX.source.lowrangeY .......................................................................................................7-274
smuX.source.offfunc .............................................................................................................7-275
smuX.source.offlimitY ...........................................................................................................7-276
smuX.source.offmode...........................................................................................................7-277
smuX.source.output..............................................................................................................7-278
smuX.source.outputenableaction..........................................................................................7-279
smuX.source.rangeY.............................................................................................................7-280
smuX.source.settling.............................................................................................................7-281
smuX.source.sink..................................................................................................................7-282
smuX.trigger.arm.count......................................................................................................... 7-283
smuX.trigger.arm.set() ..........................................................................................................7-284
smuX.trigger.arm.stimulus.....................................................................................................7-285
smuX.trigger.ARMED_EVENT_ID ........................................................................................7-286
smuX.trigger.autoclear..........................................................................................................7-287
smuX.trigger.count................................................................................................................7-287
smuX.trigger.endpulse.action................................................................................................7-289
smuX.trigger.endpulse.set()..................................................................................................7-289
smuX.trigger.endpulse.stimulus............................................................................................7-291

Model 2651A High Power System SourceMeter® Instrument Reference Manual Table of contents
smuX.trigger.endsweep.action..............................................................................................7-292
smuX.trigger.IDLE_EVENT_ID .............................................................................................7-293
smuX.trigger.initiate()............................................................................................................7-294
smuX.trigger.measure.action ................................................................................................7-295
smuX.trigger.measure.set()...................................................................................................7-296
smua.trigger.measure.stimulus.............................................................................................7-297
smuX.trigger.measure.Y().....................................................................................................7-298
smuX.trigger.MEASURE_COMPLETE_EVENT_ID..............................................................7-299
smuX.trigger.PULSE_COMPLETE_EVENT_ID....................................................................7-299
smuX.trigger.source.action....................................................................................................7-300
smuX.trigger.source.limitY ....................................................................................................7-301
smuX.trigger.source.linearY()................................................................................................7-302
smuX.trigger.source.listY()....................................................................................................7-303
smuX.trigger.source.logY()....................................................................................................7-304
smuX.trigger.source.set()......................................................................................................7-306
smuX.trigger.source.stimulus................................................................................................7-307
smuX.trigger.SOURCE_COMPLETE_EVENT_ID ................................................................7-308
smuX.trigger.SWEEP_COMPLETE_EVENT_ID...................................................................7-309
smua.trigger.SWEEPING_EVENT_ID ..................................................................................7-309
status.condition.....................................................................................................................7-311
status.measurement.*...........................................................................................................7-313
status.measurement.buffer_available.*.................................................................................7-315
status.measurement.current_limit.*.......................................................................................7-317
status.measurement.instrument.*.......................................................................................... 7-318
status.measurement.instrument.smuX.* ...............................................................................7-319
status.measurement.reading_overflow.*...............................................................................7-321
status.measurement.sink_limit.*............................................................................................ 7-323
status.measurement.voltage_limit.* ......................................................................................7-324
status.node_enable...............................................................................................................7-325
status.node_event.................................................................................................................7-327
status.operation.*..................................................................................................................7-329
status.operation.calibrating.*.................................................................................................7-332
status.operation.instrument.*.................................................................................................7-333
status.operation.instrument.digio.*........................................................................................ 7-335
status.operation.instrument.digio.trigger_overrun.*...............................................................7-337
status.operation.instrument.lan.*...........................................................................................7-339
status.operation.instrument.lan.trigger_overrun.*..................................................................7-341
status.operation.instrument.smuX.* ......................................................................................7-343
status.operation.instrument.smuX.trigger_overrrun.*............................................................7-345
status.operation.instrument.trigger_blender.*........................................................................7-347
status.operation.instrument.trigger_blender.trigger_overrun.* ..............................................7-349
status.operation.instrument.trigger_timer.* ...........................................................................7-351
status.operation.instrument.trigger_timer.trigger_overrun.* ..................................................7-352
status.operation.instrument.tsplink.* .....................................................................................7-354
status.operation.instrument.tsplink.trigger_overrun.*............................................................7-356
status.operation.measuring.*.................................................................................................7-358
status.operation.remote.*......................................................................................................7-359
status.operation.sweeping.*.................................................................................................. 7-361
status.operation.trigger_overrun.*......................................................................................... 7-362
status.operation.user.*..........................................................................................................7-365
status.questionable.*.............................................................................................................7-367
status.questionable.calibration.*............................................................................................7-369
status.questionable.instrument.*...........................................................................................7-370
status.questionable.instrument.smuX.*.................................................................................7-371
status.questionable.over_temperature.*................................................................................7-373
status.questionable.unstable_output.* ..................................................................................7-375
status.request_enable...........................................................................................................7-376
status.request_event.............................................................................................................7-378
status.reset().........................................................................................................................7-380
status.standard.*...................................................................................................................7-381
status.system.*......................................................................................................................7-383

Table of contents Model 2651A High Power System SourceMeter® Instrument Reference Manual
status.system2.*....................................................................................................................7-385
status.system3.*....................................................................................................................7-388
status.system4.*....................................................................................................................7-390
status.system5.*....................................................................................................................7-392
SweepILinMeasureV()...........................................................................................................7-394
SweepIListMeasureV().......................................................................................................... 7-395
SweepILogMeasureV() .........................................................................................................7-396
SweepVLinMeasureI()...........................................................................................................7-398
SweepVListMeasureI().......................................................................................................... 7-399
SweepVLogMeasureI() .........................................................................................................7-400
timer.measure.t()...................................................................................................................7-402
timer.reset()...........................................................................................................................7-403
trigger.blender[N].clear() .......................................................................................................7-403
trigger.blender[N].EVENT_ID................................................................................................7-404
trigger.blender[N].orenable....................................................................................................7-405
trigger.blender[N].overrun .....................................................................................................7-406
trigger.blender[N].reset().......................................................................................................7-407
trigger.blender[N].stimulus[M] ...............................................................................................7-407
trigger.blender[N].wait()......................................................................................................... 7-409
trigger.clear().........................................................................................................................7-410
trigger.EVENT_ID .................................................................................................................7-410
trigger.timer[N].clear() ...........................................................................................................7-411
trigger.timer[N].count.............................................................................................................7-412
trigger.timer[N].delay.............................................................................................................7-412
trigger.timer[N].delaylist ........................................................................................................7-413
trigger.timer[N].EVENT_ID....................................................................................................7-414
trigger.timer[N].overrun .........................................................................................................7-415
trigger.timer[N].passthrough..................................................................................................7-416
trigger.timer[N].reset()...........................................................................................................7-417
trigger.timer[N].stimulus ........................................................................................................7-418
trigger.timer[N].wait().............................................................................................................7-419
trigger.wait()..........................................................................................................................7-420
tsplink.group..........................................................................................................................7-421
tsplink.master........................................................................................................................7-422
tsplink.node...........................................................................................................................7-423
tsplink.readbit()...................................................................................................................... 7-424
tsplink.readport()...................................................................................................................7-425
tsplink.reset().........................................................................................................................7-426
tsplink.state........................................................................................................................... 7-427
tsplink.trigger[N].assert().......................................................................................................7-428
tsplink.trigger[N].clear().........................................................................................................7-429
tsplink.trigger[N].EVENT_ID..................................................................................................7-430
tsplink.trigger[N].mode ..........................................................................................................7-431
tsplink.trigger[N].overrun.......................................................................................................7-433
tsplink.trigger[N].pulsewidth ..................................................................................................7-434
tsplink.trigger[N].release().....................................................................................................7-435
tsplink.trigger[N].reset().........................................................................................................7-436
tsplink.trigger[N].stimulus......................................................................................................7-437
tsplink.trigger[N].wait() ..........................................................................................................7-438
tsplink.writebit().....................................................................................................................7-439
tsplink.writeport()...................................................................................................................7-440
tsplink.writeprotect ................................................................................................................7-441
tspnet.clear().........................................................................................................................7-442
tspnet.connect() ....................................................................................................................7-443
tspnet.disconnect()................................................................................................................7-444
tspnet.execute() ....................................................................................................................7-445
tspnet.idn()............................................................................................................................ 7-446
tspnet.read()..........................................................................................................................7-447
tspnet.readavailable()............................................................................................................7-448
tspnet.reset().........................................................................................................................7-449
tspnet.termination()...............................................................................................................7-449

Model 2651A High Power System SourceMeter® Instrument Reference Manual Table of contents
tspnet.timeout........................................................................................................................7-450
tspnet.tsp.abort()................................................................................................................... 7-451
tspnet.tsp.abortonconnect.....................................................................................................7-452
tspnet.tsp.rbtablecopy().........................................................................................................7-453
tspnet.tsp.runscript() .............................................................................................................7-454
tspnet.write() .........................................................................................................................7-455
userstring.add().....................................................................................................................7-456
userstring.catalog() ...............................................................................................................7-457
userstring.delete().................................................................................................................7-458
userstring.get()......................................................................................................................7-458
waitcomplete().......................................................................................................................7-459
Troubleshooting guide ............................................................................................8-1
Introduction .......................................................................................................................... 8-1
Error levels........................................................................................................................... 8-1
Effects of errors on scripts ................................................................................................... 8-2
Retrieving errors................................................................................................................... 8-2
Error summary list................................................................................................................ 8-3
LAN troubleshooting suggestions ........................................................................................ 8-8
Frequently asked questions....................................................................................9-1
How do I display the instrument's serial number? ............................................................... 9-1
How do I optimize performance? ......................................................................................... 9-2
Disabling autozero to increase speed.......................................................................................9-2
How do I upgrade the firmware?.......................................................................................... 9-2
How do I use the digital I/O port?......................................................................................... 9-3
How do I trigger other instruments?..................................................................................... 9-3
Triggering a scanner .................................................................................................................9-3
Interactive trigger programming ................................................................................................9-4
More information about triggering .............................................................................................9-4
How do I generate a GPIB service request?........................................................................ 9-4
Setting up a service request...................................................................................................... 9-4
Service request programming example.....................................................................................9-5
Polling for SRQs........................................................................................................................ 9-5
How do I store measurements in nonvolatile memory?....................................................... 9-5
When should I change the output-off state?........................................................................ 9-6
How do I make contact check measurements?................................................................... 9-6
How do I make low-current measurements? ....................................................................... 9-7
Low-current connections...........................................................................................................9-7
Low-current measurement programming example....................................................................9-9
How can I change the line frequency or voltage?................................................................ 9-9
Where can I get the LabVIEW driver? ................................................................................. 9-9
What should I do if I get an 802 interlock error?................................................................ 9-10
Why is the reading value 9.91e37?.................................................................................... 9-10

Table of contents Model 2651A High Power System SourceMeter® Instrument Reference Manual
Next steps............................................................................................................... 10-1
Additional Model 2651A information .................................................................................. 10-1
Maintenance........................................................................................................... 11-1
Introduction ........................................................................................................................ 11-1
Line fuse replacement........................................................................................................ 11-1
Front-panel tests ................................................................................................................ 11-2
Keys test .................................................................................................................................11-2
Display patterns test................................................................................................................11-3
Upgrading the firmware...................................................................................................... 11-4
Using TSB to upgrade the firmware........................................................................................11-5
Calibration.............................................................................................................. 12-1
Verification ......................................................................................................................... 12-1
Calibration test requirements ..................................................................................................12-2
Restoring factory defaults........................................................................................................12-4
Performing the calibration test procedures..............................................................................12-5
Current source accuracy.........................................................................................................12-7
Current measurement accuracy..............................................................................................12-9
-45 A high speed ADC pulse verification script .....................................................................12-11
Voltage source accuracy.......................................................................................................12-13
Voltage measurement accuracy............................................................................................12-14
Adjustment ....................................................................................................................... 12-16
Environmental conditions......................................................................................................12-16
Adjustment considerations....................................................................................................12-17
Calibration adjustment overview ...........................................................................................12-19
Calibration commands quick reference................................................................................. 12-21
Adjustment procedure...........................................................................................................12-22
LAN concepts and settings................................................................................... 13-1
Overview ............................................................................................................................ 13-1
Establishing a point-to-point connection............................................................................ 13-1
Step 1: Identify and record the existing IP configuration ......................................................... 13-2
Step 2: Disable DHCP to use the existing computer IP address.............................................13-3
Step 3: Configure the LAN settings of the instrument .............................................................13-4
Step 4: Install the crossover cable ..........................................................................................13-5
Step 5: Access the web interface of the instrument ................................................................13-6
Connecting to the LAN....................................................................................................... 13-6
Setting the LAN configuration method.....................................................................................13-7
Setting the IP address.............................................................................................................13-7
Setting the gateway................................................................................................................. 13-8
Setting the subnet mask..........................................................................................................13-8
Configuring the domain name system (DNS)..........................................................................13-8
LAN speeds........................................................................................................................ 13-9
Duplex mode.................................................................................................................... 13-10
Viewing LAN status messages ........................................................................................ 13-10
Viewing the network settings ........................................................................................... 13-11

Model 2651A High Power System SourceMeter® Instrument Reference Manual Table of contents
Confirming the active speed and duplex negotiation............................................................. 13-12
Confirming port numbers.......................................................................................................13-12
Selecting a LAN interface protocol................................................................................... 13-13
VXI-11 connection.................................................................................................................13-13
Raw socket connection .........................................................................................................13-13
Dead socket connection........................................................................................................13-14
Telnet connection..................................................................................................................13-14
Logging LAN trigger events in the event log.................................................................... 13-17
Accessing the event log from the command interface...........................................................13-19
Common commands.............................................................................................. 14-1
Common command summary............................................................................................ 14-1
Script command equivalents.............................................................................................. 14-3
Command reference .......................................................................................................... 14-3
Identification query: *IDN?.......................................................................................................14-3
Operation complete and query: *OPC and *OPC?..................................................................14-4
Reset: *RST............................................................................................................................ 14-4
Self-test query: *TST?.............................................................................................................14-4
Trigger: *TRG..........................................................................................................................14-4
Wait-to-continue: *WAI............................................................................................................14-5
General bus commands..................................................................................................... 14-5
REN ........................................................................................................................................14-5
IFC..........................................................................................................................................14-6
LLO.........................................................................................................................................14-6
GTL.........................................................................................................................................14-6
DCL......................................................................................................................................... 14-6
SDC ........................................................................................................................................14-7
GET.........................................................................................................................................14-7
SPE, SPD................................................................................................................................14-7
Status model ..........................................................................................................15-1
Overview ............................................................................................................................ 15-1
Status register set contents.....................................................................................................15-1
Queues ...................................................................................................................................15-2
Status function summary.........................................................................................................15-4
Status model diagrams ...........................................................................................................15-5
Clearing registers............................................................................................................. 15-13
Programming and reading registers................................................................................. 15-13
Programming enable and transition registers........................................................................ 15-14
Reading registers.................................................................................................................. 15-14
Status byte and service request (SRQ) ........................................................................... 15-15
Status Byte Register .............................................................................................................15-15
Service Request Enable Register .........................................................................................15-17
Serial polling and SRQ..........................................................................................................15-18
SPE, SPD (serial polling) ......................................................................................................15-18
Status byte and service request commands..........................................................................15-19
Enable and transition registers..............................................................................................15-19
Controlling node and SRQ enable registers..........................................................................15-19
Status register sets .......................................................................................................... 15-20
System Summary Registers..................................................................................................15-20
Standard Event Register.......................................................................................................15-21
Operation Status Registers...................................................................................................15-23