TDK-Lambda Genesys Series User manual

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USER MANUAL FOR
IEEE PROGRAMMING INTERFACE
FOR GENESYSTM
POWER SUPPLIES
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Table of Contents
1. THE DIGITAL (IEEE 488.2 SCPI) PROGRAMMING OPTION..................................1
1.1 INTRODUCTION ...........................................................................................................................................1
1.2 SCOPE OF MANUAL.....................................................................................................................................1
1.3 CONFIGURATION.........................................................................................................................................1
1.4 GLOSSARY......................................................................................................................................................1
1.5 USING DIGITAL PROGRAMMING ...........................................................................................................2
1.5.1 THE IEEE-488.2 INTERFACE 2
1.6 POINT-TO-POINT MODE vs MULTI DROP MODE ................................................................................2
1.7 CONFIGURING THE IEEE INTERFACE..................................................................................................3
1.7.1 SETTING THE POWER SUPPLY AND IEEE SELECT SWITCH 3
1.7.2 CONFIGURING THE IEEE CONTROLLER 3
1.8 CONFIGURING THE SUPPLIES.................................................................................................................4
1.9 THE INTERFACE INPUT BUFFER ............................................................................................................4
1.10 GETTING STARTED WITH THE SOFTWARE....................................................................................4
1.10.1 EXAMPLE SESSION USING THE ‘IBIC’ CONSOLE 4
1.10.2 EXAMPLE PROGRAM WRITTEN IN VISUAL BASIC 5
1.10.3 EXAMPLE PROGRAM WRITTEN IN LABVIEW 6
2. PROGRAMMING COMMANDS ................................................................................7
2.1 COMMAND NOTES.......................................................................................................................................7
2.2 PROGRAMMING AND MESUREMENT COMMANDS ..........................................................................7
2.2.1 PROGRAM OUTPUT VOLTAGE 7
2.2.2 READ PROGRAMMED VOLTAGE COMMAND 8
2.2.3 MEASURE VOLTAGE COMMAND 8
2.2.4 PROGRAM OUTPUT CURRENT COMMAND 8
2.2.5 READ PROGRAMMED CURRENT COMMAND 8
2.2.6 MEASURE CURRENT COMMAND 9
2.2.7 ENABLE THE SUPPLY OUTPUT COMMAND 9
2.2.8 DISABLE THE SUPPLY OUTPUT COMMAND 9
2.2.9 READ OUTPUT ENABLE COMMAND 9
2.2.10 GO TO LOCAL MODE COMMAND 9
2.2.11 GO TO REMOTE MODE COMMAND 10
2.2.12 GO TO REMOTE WITH LOCAL LOCK OUT COMMAND 10
2.2.13 READ PROGRAMMING MODE COMMAND 10
2.3 GLOBAL OUTPUT COMMANDS .............................................................................................................10
2.3.1 USAGE 10
2.3.2 GLOBAL PROGRAM OUTPUT VOLTAGE 11
2.3.3 GLOBAL PROGRAM OUTPUT CURRENT 11
2.3.4 GLOBAL EANBLE THE SUPPLY OUTPUT COMMAND 11

2.3.5 GLOBAL DISABLE THE SUPPLY OUTPUT COMMAND 11
2.3.6 GLOBAL RESET COMMAND 11
2.3.7 GLOBAL SAVE POWER SUPPLY SETTINGS COMMAND 12
2.3.8 GLOBAL RECALL POWER SUPPLY SETTINGS COMMAND 12
2.4 OUTPUT PROTECTION COMMANDS ...................................................................................................12
2.4.1 OVER VOLTAGE PROTECTION 12
2.4.2 CURRENT FOLD BACK PROTECTION 14
2.5 OPERATING CONDITION COMMANDS ...............................................................................................15
2.5.1 SYSTEM ERROR ENABLE COMMAND 15
2.5.2 READ SYSTEM ERROR COMMAND 15
2.5.3 READ SUPPLY OUTPUT MODE COMMAND 15
2.5.4 SET POWER SUPPLY POWER-UP MODE COMMAND 15
2.5.5 REPORT POWER SUPPLY POWER-UP MODE COMMAND 16
2.5.6 READ SCPI VERSION COMMAND 16
2.6 COMMON COMMANDS ............................................................................................................................16
2.6.1 CLEAR STATUS COMMAND 16
2.6.2 SET SERVICE REQUEST ENABLE COMMAND 16
2.6.3 READ SERVICE REQUEST ENABLE COMMAND 17
2.6.4 READ STATUS BYTE COMMAND 17
2.6.5 SET STANDARD EVENT STATUS ‘ENABLE’ REGISTER COMMAND 17
2.6.6 READ STANDARD EVENT STATUS ‘ENABLE’ REGISTER COMMAND 17
2.6.7 READ STANDARD EVENT STATUS ‘EVENT’ REGISTER COMMAND 18
2.6.8 READ IDENTITY COMMAND 18
2.6.9 RESET COMMAND 18
2.6.10 SELF TEST QUERY COMMAND 18
2.6.11 OPERATION COMPLETE COMMAND 19
2.6.12 READ OPERATION COMPLETE COMMAND 19
2.6.13 SAVE POWER SUPPLY SETTINGS COMMAND 19
2.6.14 RECALL POWER SUPPLY SETTINGS COMMAND 19
2.7 INSTRUMENT SELECT COMMANDS ....................................................................................................20
2.7.1 SELECT SUPPLY 20
2.7.2 READ SELECTED SUPPLY NUMBER 20
2.8 STATUS COMMANDS .................................................................................................................................20
2.8.1 READ OPERATIONAL CONDITION ‘EVENT’ REGISTER COMMAND 20
2.8.2 READ OPERATIONAL CONDITION ‘CONDITION’ REGISTER COMMAND 21
2.8.3 SET OPERATIONAL CONDITION ‘ENABLE’ REGISTER COMMAND 21
2.8.4 READ OPERATIONAL CONDITION ‘ENABLE’ REGISTER COMMAND 21
2.8.5 READ QUESTIONABLE CONDITION ‘EVENT’ REGISTER COMMAND 21
2.8.6 READ QUESTIONABLE CONDITION ‘CONDITION’ REGISTER COMMAND 21
2.8.7 SET QUESTIONABLE CONDITION ‘ENABLE’ REGISTER COMMAND 22
2.8.8 READ QUESTIONABLE CONDITION ‘ENABLE’ REGISTER COMMAND 22
2.8.9 SET QUESTIONABLE INSTRUMENT SUMMARY ‘ENABLE’ REGISTER COMMAND 22
2.8.10 READ QUESTIONABLE INSTRUMENT SUMMARY ‘ENABLE’ REGISTER COMMAND 22
2.8.11 READ QUESTIONABLE INSTRUMENT SUMMARY ‘EVENT’ REGISTER COMMAND 22
2.8.12 STATUS PRESET COMMAND 22
2.9 USING ERROR AND STATUS REGISTERS............................................................................................23
2.9.1 OVERVIEW: REGISTER FAN-OUT 23
2.9.2 GLOSSARY OF REGISTER TERMS 23
2.9.3 CLEAR ALL STATUS REGISTERS 24
2.9.4 SERVICE REQUESTS AND STATUS BYTE REGISTER 24
2.9.5 STANDARD EVENT STATUS ‘EVENT’ REGISTER 25

2.9.6 THE OPERATIONAL REGISTERS 26
2.9.7 THE QUESTIONABLE CONDITION REGISTERS 27
2.9.8 THE SUMMARY REGISTERS 28
3. SYSTEM:ERROR MESSAGES...............................................................................29
List of Figures
FIGURE 1. MULTI DROP POWER SUPPLIES CONFIGURATION ..................................................................2
FIGURE 2. IEEE CONNECTOR AND IEEE SELECT SWITCH LOCATION ...................................................3
FIGURE 3. IEEE SELECT SWITCH ..................................................................................................3
FIGURE 4. STATUS AND ERROR REGISTER TREE POINT-TO-POINT MODE.............................................31
FIGURE 5. STATUS AND ERROR REGISTER TREE MULTI DROP MODE ..................................................32
FIGURE 6. INSTRUMENT SUMMARY REGISTER TREE MULTI DROP MODE..............................................33
List of Tables
TABLE 1. THE STATUS BYTE REGISTER ............................................................................................................24
TABLE 2. THE STANDARD EVENT STATUS REGISTER...........................................................................................25
TABLE 3. THE OPERATIONAL REGISTERS ..........................................................................................................26
TABLE 4. THE QUESTIONABLE REGISTERS ........................................................................................................27
TABLE 5. SYSTEM ERROR CODES ...................................................................................................................29
NOTES .......................................................................................................................................................34

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1. THE DIGITAL (IEEE 488.2 SCPI) PROGRAMMING OPTION
1.1 INTRODUCTION
The internal factory installed GPIB interface allows to operate the GenesysTM Power Supply
from a computer via IEEE-488 communication bus.
The GPIB interface allows the user complete remote control of the power supply, including
output voltage and current limit programming, setting the Over Voltage Protection, Under
Voltage Limit and Foldback protection. The Output Voltage and Output Current can be
measured and the power supply status can be monitored.
Commands that are standard with digital programming include:
%Program Voltage %Program Current
%Measure Voltage %Measure Current
%Over-Voltage Shutdown %Current Fold Back Shutdown
%IEEE-488.2 Compliant %SCPI Compliant
1.2 SCOPE OF MANUAL
This manual contains the information needed to operate the optional embedded digital
interface used in the Power Supply. The interface is contained on one circuit card. It is op-
tionally installed by the factory at the time of manufacture.
1.3 CONFIGURATION
To operate on the IEEE 488.2 bus, each supply will require that an IEEE Programming
Interface be installed.
1.4 GLOSSARY
1. The HOST PC will be the computer in control of the GEN supply(s) when operating under com-
puter (Remote) control.
2. Point-to-Point Mode will mean that 1 IEEE Interface can control only 1 GEN supply.
3. Multi Drop Mode will mean that 1 IEEE Interface can control more than 1 GEN supply.
4. When in Multi Drop Mode the GEN supply with the IEEE Interface installed will be referred to
as the Master Supply and all other attached supplies will be referred to as Slave Supplies.
5. A Communication Collision (AKA collision) is an event when in Multi Drop Mode more than 1
GEN supply attempts to transmit data simultaneously.
6. The Main micro. is the microprocessor installed on the GENESYS power supply control board
that monitors/controls all power supply activity.
7. The IEEE micro. is the microprocessor installed on the IEEE Interface that is installed within
the power supply.
8. Local Mode means that the supply under control of the “Front Panel Knob” or “Rear Panel
Analog Remote” inputs.
9. Remote Mode means that the supply operating under direction of HOST PC/IEEE Interface via
the IEEE488.2 Bus. Front panel does not operate except to view settings.
10. Serial Interface means that the Master supply is interfaced to the IEEE Interface via RS-232
digital communications and Slave supplies are interfaced to the IEEE Interface via RS485
daisy chain from the Master supply. This is done to activate Remote Control or to monitor sup-
ply activity while in Local Mode.
11. Instrument Summary Bit is a bit in an Instrument Summary Register (Ref. Figure 6 and


2.9.8.1) indicating the address of a supply that sent an SRQ.
1.5 USING DIGITAL PROGRAMMING
1.5.1 THE IEEE-488.2 INTERFACE
The IEEE-488 digital programming interface (also called the GPIB interface) is a popu-
lar way to connect instruments to a computer. It uses a specialized 24-pin cable with
connectors that allow cables to be ‘stacked’ together. There are eight data wires; eight
control wires and eight ground wires. If the system runs from a personal computer, there
are numerous vendors of IEEE controller cards and software.
The IEEE-488 standard has gone through several upgrades. The IEEE-488.1 focused
on the handshaking of the eight control lines. The IEEE-488.2 added status registers
inside each instrument and it added common commands to make programming groups
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syntax so one vendor’s power supply will use the same commands as another’s. The
Interface follows all of these standards.
Because many instruments may be connected and independently controlled by a single
IEEE controller, each instrument must have a unique address. The IEEE controller auto-
matically sets its address equal to the power supply address.
1.6 POINT-TO-POINT MODE vs MULTI DROP MODE
Upon application of AC power to the Power Supply, the PS IEEE Interface will query the
Power Supply to test if the Multi Drop installed. If the Multi Drop Option is installed, the
IEEE Interface will activate the Multi-Drop mode (regardless of the number of units con-
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is shown in Figure 1. . If the Multi Drop Option is not installed, the IEEE Interface will
activate the Point-to-Point mode.
When more than one Power Supply is connected to a single Power Supply with IEEE
Interface (in Multi-Drop mode), all of the Power Supplies must have the Multi Drop Option
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1.7 CONFIGURING THE IEEE INTERFACE
1.7.1 SETTING THE POWER SUPPLY AND IEEE SELECT SWITCH
Power supply setting – set rear panel DIP switch (SW1) all contact to Down position.
The interface contains a two position DIP switch that is accessible from the rear of the
Power Supply and located next to the IEEE cable connector. Switch 2, located to the right
of Switch1, is not used. Refer to Figure 2 for location of the IEEE connector and the IEEE
select switch at the rear panel of the supply.
Figure 2. IEEE Connector and IEEE Select Switch Location
Placing Switch 1 in the ON Position, up, will activate this interface and deactivate the
Power Supply’s Serial I/O capability. Placing Switch 1 in the OFF Position, down, will
deactivate this interface and activate the Power Supply’s Serial (RS232 or RS485) I/O
capability.
The position of Switch 1 may be changed at any time; but the new setting will not take
affect until the power is switched off and on.
UP Down
Figure 3. IEEE Select Switch
1.7.2 CONFIGURING THE IEEE CONTROLLER
A typical IEEE controller is a personal computer with an IEEE interface card. Each card
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 Controller Address = 0. This is factory default for all controllers.
 EOI Flag = TRUE. The “End or Identify” is a control line in the IEEE cable that is
asserted when the last character of a message string is sent. It is required for this
interface.
 EOS Flag = FALSE: The “End of String”, used in some instruments to indicate the
last character of a message, is not supported by this interface.
IEEE select
switch
IEEE 488
connector

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1.8 CONFIGURING THE SUPPLIES
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dress of the Master Supply as its IEEE address.
Slave supplies must be given a unique address that is different than the address of the
Master supply. No two supplies may be given the same address. All Slave supplies must
be set for RS485 operation at 19,200 Baud transmission rate.
1.9 THE INTERFACE INPUT BUFFER
The Interface contains a 210 byte input buffer to save commands as they are received from
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and the command:
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The user may enter more than 1 concatenated command, separated by semicolons, to be
executed. The interface will process all commands before returning any data/status to the
IEEE bus or accepting any new commands to execute. Messages returned to the user will
be the result of the last command executed.
If a command error exists, or the Power Supply reports an error, all subsequent commands
in the buffer will be terminated and the status returned to the user.
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1.10 GETTING STARTED WITH THE SOFTWARE
A computer can use a variety of controllers, programs, and programming languages for the
IEEE bus. Here is an example showing a minimal program to set the voltage, set the cur-
rent and measure the voltage from a power supply.
1.10.1 EXAMPLE SESSION USING THE ‘IBIC’ CONSOLE
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exe). As the operator types each command on the computer, at the colon prompt, it is im-
mediately sent to the power supply. This example works only for computers with National
Instruments and compatible IEEE controller cards.
Win32 Interactive Control
Copyright 1996 National Instruments Corporation
All rights reserved.
Type ‘help’ for help or ‘q’ to quit.
: ibdev Controller address
enter board index: 0 Supply Address
enter primary address: 6
enter secondary address: 0
enter timeout: 12

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enter end-of-string mode/byte: 10
Program supply to
ud0: ibwrt “sour:volt 100” 100 volts output
[0100] ( cmpl )
count: 12
Program supply to
ud0: ibwrt “sour:curr 5” 5 amps output
[0100] ( cmpl )
count: 11
Query: “What is
ud0: ibwrt “meas:volt?” output voltage?”
[0100] ( cmpl )
count: 10 Read response
ud0: ibrd 50
[2100] ( end cmpl ) Supply reported output voltage
count: 11
31 30 30 2e 30 38 0a 1 0 0 . 0 8 .
1.10.2 EXAMPLE PROGRAM WRITTEN IN VISUAL BASIC
Microsoft’s Visual Basic is a windows programming language that may be used to create
“virtual instruments” and automation programs. Here is a simple program which sends
commands to a power supply to set the voltage, set the current and measure the voltage.
The program’s window only contains two items: a “Start” button and a text box to show
the measured voltage. The syntax of the CALLed functions are correct only for National
Instruments and compatible IEEE controllers. Don’t forget to add the forms “Ni-global.bas”
and “Vbib-32.bas” to your project.
Example Program Written in Visual Basic
Option Explicit
Dim SupplyUD As Integer ‘supply device descriptor
Dim strMeasVolt As String * 50 ‘buffer for reading input message
Private Declare Function GetTickCount Lib “kernel32” () As Long
Private Sub cmdStart_Click()
‘start program here after “Start” button clicked
‘open IEEE port, get “User Device Description” = SupplyUD


‘assume power supply address is set to “6” on DIP switch
Call ibdev(0, 6, 0, T3s, 1, 10, intSupplyUD)
Call ibwrt(SupplyUD, “:volt 100”) ‘program output to 100 volts
Call ibwrt(SupplyUD, “:curr 2”) ‘program output to 2 amps
Wait 500 ‘wait 0.5 sec to settle
Call ibwrt(SupplyUD, “meas:volt?”) ‘ask “What is output voltage?”
Call ibrd(SupplyUD, strMeasVolt) ‘read back output voltage
txtOutVolt.Text = strMeasVolt ‘display output voltage on window
End Sub
Private Sub Wait(mSecWait As Long)
‘subroutine to wait “mSecWait” milliseconds
Dim StartTime As Long
StartTime = GetTickCount
Do
Loop While (GetTickCount - StartTime < mSecWait)
End Sub
1.10.3 EXAMPLE PROGRAM WRITTEN IN LABVIEW
The National Instruments LabVIEW programming language is a popular language which is opti-
mized for instrument control and data analysis. It is a graphical language where functions are shown
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sends commands to a power supply to set the voltage, set the current and measure the voltage. The
program’s window only contains two items: a numeric control for the supply IEEE address and a text
indicator to show the measured voltage.


2. PROGRAMMING COMMANDS
2.1 COMMAND NOTES
Expressions enclosed in square brackets, [ ], are optional and entered without the [ or ].
Expressions enclosed in greater than/less than, < >, are programming values and entered
without the < or >.
The expression <SP> represents a one character ASCII Space.
In all commands upper case characters can be interchanged with lower case characters.
WORD CAN BE REPLACED WITH
:AMPLITUDE :AMPL
:CONDITION :COND
:CURRENT :CURR
:ENABLE :ENAB
:ERROR? :ERR?
:EVENT :EVEN
GLOBAL GLOB
INSTRUMENT INST
:IMMEDIATE :IMM
:ISUMMARY1 :ISUM1
:ISUMMARY2 :ISUM2
:ISUMMARY3 :ISUM3
:LEVEL :LEV
:LIMIT :LIM
MEASURE MEAS
MODE? MOD?
:NSELECT :NSEL
:OPERATION :OPER
:OUTPUT OUTP
:PRESET :PRES
:PROTECTION :PROT
:QUESTIONABLE :QUES
:SELECT :SEL
SOURCE SOUR
:STATE :STAT
STATUS STAT
SYSTEM SYST
:TRIPPED :TRIP
:VERSION :VERS
:VOLTAGE :VOLT
2.2 PROGRAMMING AND MESUREMENT COMMANDS
2.2.1 PROGRAM OUTPUT VOLTAGE
The output voltage can be programmed by sending the command:
[SOURce]:VOLTage[:LEVel][:IMMediate][:AMPLitude]<SP> <value>
where <value> is any valid voltage with or without a decimal place.


Alternate Format:
SOURCE:VOLTAGE<SP><value>
:VOLTAGE:AMPLITUDE<SP><value>
:VOLTAGE<SP><value>
Examples:
SOURCE:VOLTAGE:AMPLITUDE 15.77
:VOLTAGE 3.25
2.2.2 READ PROGRAMMED VOLTAGE COMMAND
To read what voltage the supply was programmed to, regardless of the actual voltage,
send the following command and read the response message.
[SOURce]:VOLTage[:AMPLitude]?
Alternate Format:
SOURCE:VOLTAGE?
:VOLTAGE:AMPLITUDE?
:VOLTAGE?
Examples:
SOURCE:VOLTAGE:AMPLITUDE?
:VOLTAGE?
2.2.3 MEASURE VOLTAGE COMMAND
The output voltage can be measured by sending the command:
MEASure:VOLTage?
When the controller does the next IEEE Read, the interface will send the measured
voltage to it.
Example:
MEASURE:VOLTAGE?
2.2.4 PROGRAM OUTPUT CURRENT COMMAND
The output current is programmed by sending the command:
[SOURce]:CURRent[:LEVel][:IMMediate][:AMPLitude]<SP><value>
where < value > is any valid current with or without a decimal place.
Alternate Formats:
SOURCE:CURRENT<SP><value>
:CURRENT:AMPLITUDE<SP><value>
:CURRENT<SP><value>
Examples:
SOURCE:CURRENT:AMPLITUDE 15.77
:CURRENT 3.25
2.2.5 READ PROGRAMMED CURRENT COMMAND
To read what current the supply was programmed to, regardless of the actual current, send the
following command and read the response message.
[SOURce]:CURRent[:AMPLitude]?
Alternate Format:
SOURCE:CURRENT?
:CURRENT:AMPLITUDE?
:CURRENT?
Examples:
SOURCE:CURRENT:AMPLITUDE?
:CURRENT?


2.2.6 MEASURE CURRENT COMMAND
The output current can be measured by sending the SCPI command:
MEASure:CURRent?
When the controller does the next IEEE Read, the supply will return the amperes of current
being produced
Example:
MEASURE:CURRENT?
2.2.7 ENABLE THE SUPPLY OUTPUT COMMAND
The power supply output can be turned on by sending this command:
OUTPut:STATe<SP>1
The output will immediately jump to the last programmed voltage and current.
Example:
OUTPUT:STATE 1
Notes:
1 can be replaced with ON
2.2.8 DISABLE THE SUPPLY OUTPUT COMMAND
The power supply output can be shut off by sending this command:
OUTPut:STATe<SP>0
This command is equivalent to programming the output to zero volts.
Example:
OUTPUT:STATE 0
Notes:
0 can be replaced with OFF
2.2.9 READ OUTPUT ENABLE COMMAND
Reads the Power Supply output enable. Places a 1 in the output queue if the supply is enabled
and a 0 if the supply is disabled.
Syntax:
OUTPut:STATe?
Example:
OUTPUT:STATE?
2.2.10 GO TO LOCAL MODE COMMAND
Places the supply under control of the Front Panel Controls.
Syntax:
SYSTem:SET<SP><0>
Example:
SYSTEM:SET 0
Notes:
0 can be replaced with LOC


2.2.11 GO TO REMOTE MODE COMMAND
Places the supply under control of the IEEE Interface.
Syntax:
SYSTem:SET<SP><1>
Example:
SYSTEM:SET 1
Notes:
1 can be replaced with REM
2.2.12 GO TO REMOTE WITH LOCAL LOCK OUT COMMAND
Places the supply under control of the IEEE Interface and disables the Front Panel Go To Local
Button.
Syntax:
SYSTem:SET<SP><2>
Example:
SYSTEM:SET 2
Notes:
2 can be replaced with LLO
2.2.13 READ PROGRAMMING MODE COMMAND
Reads the mode of the Power Supply. Place a 0 in the output queue if the supply is in Local
Mode, a 1 if the supply is in Remote Mode and a 2 if the supply is in Remote Mode with Local
Lock Out.
Syntax:
SYSTem:SET?
Example:
SYSTEM:SET?
Returns:
“LOC”
“REM”
”LLO”
2.3 GLOBAL OUTPUT COMMANDS
2.3.1 USAGE
% Global Commands are not SCPI compliant
% Supplies acting upon Global Commands need not be a currently addressed supply
% All supplies attached to the Interface must be capable of accepting Global Commands
% No messages, OPC or Not Busy will be returned to the HOST PC after a Global Command has been is-
sued. The Busy Bit of the Status Byte, see Figure 1 and Figure 2, will be set to 0 after this command is
issued.
% It will be the responsibility of the User Software to add a 200 Ms delay after each Global Command is
issued and before any other command can be issued.


2.3.2 GLOBAL PROGRAM OUTPUT VOLTAGE
The output voltage of all supplies can be programmed by sending the command:
GLOBal:VOLTage[:LEVel][:IMMediate][:AMPLitude]<SP> <value>
where <value> is any valid voltage with or without a decimal place.
Alternate Format:
none
Example:
GLOBAL:VOLTAGE:AMPLITUDE 15.77
2.3.3 GLOBAL PROGRAM OUTPUT CURRENT
The output current of all supplies are programmed by sending the command:
GLOBALCURRent[:LEVel][:IMMediate][:AMPLitude]<SP><value>
where < value > is any valid current with or without a decimal place.
Alternate Formats:
none
Examples:
GLOBal:CURRENT:AMPLITUDE 15.77
2.3.4 GLOBAL EANBLE THE SUPPLY OUTPUT COMMAND
All power supply outputs can be turned on by sending this command:
GLOBal:OUTPut:STATe<SP>1
The output will immediately jump to the last programmed voltage and current.
Example:
GLOBAL:OUTPUT:STATE 1
Notes:
1 can be replaced with ON
2.3.5 GLOBAL DISABLE THE SUPPLY OUTPUT COMMAND
All power supply outputs can be shut off by sending this command:
GLOBal:OUTPut:STATe<SP>0
This command is equivalent to programming the output to zero volts.
Example:
GLOBAL:OUTPUT:STATE 0
Notes:
0 can be replaced with OFF
2.3.6 GLOBAL RESET COMMAND
Resets all Power Supplies. Voltage and current are set to 0. Supply output is set to OFF.
Supply enters Remote Mode Operation.
Syntax:
GLOBal:*RST
Example:
GLOBal:*RST

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2.3.7 GLOBAL SAVE POWER SUPPLY SETTINGS COMMAND
Sends a command to all Power Supplies causing them to save their operating set-
tings:
Programmed voltage, Current, Over Voltage, Under Voltage, Remote/Local Mode,
Auto/Safe Restart, Current Fold Back, etc. can be stored in Memory.
To change one or more settings, enter the one or more commands with new settings
and then enter this command.
Syntax:
GLOBal:*SAV<SP><0>
Example:
GLOBAL:*SAV 0
2.3.8 GLOBAL RECALL POWER SUPPLY SETTINGS COMMAND
Sends a command to all Power Supplies causing them to recall their operating set-
tings:
Recall Programmed voltage, Current, Over Voltage, Under Voltage, Remote/Local
Mode, Auto/Safe Restart and Current Fold Back. If the output of the supply was set
to an OFF condition by the Front Panel Button before the *RCL command was sent,
the supply will remain in the OFF state.
Syntax:
GLOBal :*RCL<SP><0>
Example:
GLOBAL :*RCL 0
2.4 OUTPUT PROTECTION COMMANDS
2.4.1 OVER VOLTAGE PROTECTION
2.4.1.1 SET THE OVER VOLTAGE PROTECTION LEVEL COMMAND
Set the over voltage protection level of the Power Supply to <value>, where <value> is a number
between zero and the maximum supply output voltage. A decimal point is optional.
Syntax:
[SOURce]:VOLTage:PROTection:LEVel<SP><value>
Alternate Format:
:VOLTAGE:PROTECTION:LEVEL<SP><value>
Examples:
SOURCE:VOLTAGE:PROTECTION:LEVEL 25.00
SOURCE:VOLTAGE:PROTECTION:LEVEL MAX
Notes:
If <value> equals MAX, the supply will set its over voltage to its maximum level.

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2.4.1.2 READ THE OVER VOLTAGE PROTECTION LEVEL COMMAND
Read the over voltage protection level of the Power Supply.
Syntax:
[SOURce]:VOLTage:PROTection:LEVel?
Alternate Format
:VOLTAGE:PROTECTION:LEVEL?
Example:
SOURCE:VOLTAGE:PROTECTION:LEVEL?
2.4.1.3 READ OVER VOLTAGE TRIPPED STATE COMMAND
Read if the Power Supply over voltage has tripped.
Syntax:
[SOURce]:VOLTage:PROTection:TRIPped?
Alternate Format:
:VOLTAGE:PROTECTION:TRIPPED?
Example:
SOURCE:VOLTAGE:PROTECTION:TRIPPED?
Read the response number. The normal response is “0” (zero). If a “1” (one) is returned,
an over voltage has occurred and the output is shut down.
2.4.1.4 SET THE UNDER VOLTAGE PROTECTION LEVEL COMMAND
Set the under voltage protection level of the Power Supply.
Syntax:
[SOURce]:VOLTage:LIMit:LOW<SP><value>
Alternate Format:
:VOLTAGE:LIMIT:LOW<SP><value>
Example:
SOURCE:VOLTAGE:LIMIT:LOW 25.00
2.4.1.5 READ THE UNDER VOLTAGE PROTECTION LEVEL COMMAND
Read the under voltage protection level of the Power Supply.
Syntax:
[SOURce]:VOLTage:LIMit:LOW?
Alternate Format
:VOLTAGE:LIMIT:LOW?
Example:
SOURCE:VOLTAGE:LIMIT:LOW?

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2.4.2 CURRENT FOLD BACK PROTECTION
2.4.2.1 SET CURRENT FOLD BACK PROTECTION COMMAND
Turn on the current fold back protection of the Power Supply.
Syntax:
[SOURce]:CURRent:PROTection:STATe<SP><1>
Alternate Format:
:CURRENT:PROTECTION:STATE<SP>1
Example:
SOURCE:CURRENT:PROTECTION:STATE 1
2.4.2.2 CLEAR CURRENT FOLD BACK PROTECTION COMMAND
Turn off the current fold back protection of the Power Supply.
Syntax:
[SOURce]:CURRent:PROTection:STATe<SP><0>
Alternate Format:
:CURRENT:PROTECTION:STATE<SP>0
Example:
SOURCE:CURRENT:PROTECTION:STATE 0
2.4.2.3 READ CURRENT FOLD BACK STATE COMMAND
Read if the Fold back is enabled or disabled. The interface will return an ON if Fold Back
Protection is set or an OFF if not set.
Syntax:
[SOURce]:CURRent:PROTection:STATe?
Alternate Format:
:CURRENT:PROTECTION:STATE?
Example:
SOURCE:CURRENT:PROTECTION:STATE?
2.4.2.4 READ FOLD BACK TRIPPED STATE COMMAND
Read if the Power Supply Current Fold Back has tripped. The interface will return a 1 if Fold
Back Protection has tripped or a 0 if not tripped.
Syntax:
[SOURce]:CURRent:PROTection:TRIPped?
Alternate Format:
:CURRENT:PROTECTION:TRIPPED?
Example:
SOURCE:CURRENT:PROTECTION:TRIPPED?