JDS Uniphase SCG Series User manual

SCG SERIES
FIBEROPTIC SWITCH
User’s Manual

Contents
Safety Information, Instructions, and Symbols........................................................................ 1
Safety Information .............................................................................................................1
Classification ......................................................................................................... 1
Disconnecting from Line Power............................................................................. 1
Line Power Requirements ..................................................................................... 1
Fuse Type .............................................................................................................1
Laser Application...................................................................................................1
Safety Instructions.............................................................................................................2
Before Initializing and Operating the Unit.............................................................. 2
Operating the Unit ................................................................................................. 2
Safety Symbols .................................................................................................................3
Compliance ....................................................................................................................... 4
FCC Compliance ................................................................................................... 4
CE Compliance ..................................................................................................... 5
CSA / IEC Compliance .......................................................................................... 5
UL Compliance...................................................................................................... 5
General Information and Specifications ................................................................................... 6
General Information ..........................................................................................................6
Multiple-Common (SCG-D) Switch Configuration ................................................. 7
Single-Step Multiple-Common (SCG-E) Switch Configuration .............................. 7
Multiple-Common Blocking (SCG-F) Switch Configuration ................................... 8
Key Features ......................................................................................................... 8
Applications ........................................................................................................... 8
Standard Accessories ...........................................................................................8
Specifications .................................................................................................................... 9
Getting Started .......................................................................................................................... 11
Before Initializing and Operating the Unit........................................................................11
Initial Inspection .............................................................................................................. 11
Operating Environment ................................................................................................... 12
Temperature........................................................................................................ 12
Humidity .............................................................................................................. 12
Ventilation............................................................................................................ 12
Storing and Shipping.......................................................................................................12
Claims and Repackaging ....................................................................................12
Returning Shipments to JDS Uniphase............................................................... 12
Cleaning Connectors.......................................................................................................13
Installing the Switch ........................................................................................................ 14
Operating and Maintenance Instructions ............................................................................... 15
Front Panel...................................................................................................................... 15
Operating Keys.................................................................................................... 16
Status LEDs ........................................................................................................16
Rear Panel ...................................................................................................................... 17
Making External Switch Module Connections ................................................................. 17
External Switch Module without TTL Input Controls............................................ 17
SD000343 Rev. A August 2000

External Switch Module with TTL Input Controls................................................. 18
Sample Driver Application ................................................................................... 18
Powering Up the Unit ...................................................................................................... 19
Selecting Input Channels and Output Channels ............................................................. 19
Saving and Recalling Switch or Relay Driver States....................................................... 20
Displaying Switch Details or Controlling Direct Drivers................................................... 20
Changing or Verifying the GPIB Address........................................................................ 21
Calibrating the Unit..........................................................................................................21
Maintaining the Unit ........................................................................................................21
Programming Guide ................................................................................................................. 23
GPIB Pin Assignment...................................................................................................... 23
Setting the GPIB Address ............................................................................................... 24
RS232C Pin Assignment................................................................................................. 24
Operation and Query Commands ...................................................................................25
Command Parser Rules ...................................................................................... 25
Operation Commands .........................................................................................26
Query Commands ...............................................................................................27
Status Reporting and Service Request Control ..............................................................30
Condition Register............................................................................................... 30
Status Register.................................................................................................... 30
SRQ Mask Register............................................................................................. 31
GPIB Programming Examples ........................................................................................31
Sending Commands............................................................................................ 32
Serial Polling the Status Register........................................................................ 32
Generating a Service Request Interrupt.............................................................. 33
Learn Query (LRN?)............................................................................................ 33
RS232C Programming Examples ...................................................................................33
Sending Commands............................................................................................ 34
Querying Status................................................................................................... 34
Reading the Status Register ...............................................................................34
For sales and service information,
contact JDS Uniphase or your local representative.
JDS Uniphase Corporation
570 West Hunt Club Road
Nepean, Ontario, Canada
K2G 5W8
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Website: http://www.jdsunph.com
SD000343 Rev. A August 2000

Safety Information, Instructions, and Symbols
Safety Information
Classification
The unit consists of an exposed metal chassis that is connected directly to earth via a power
cord and, therefore, is classified as a Class 1 instrument. Class 1 refers to equipment relying on
ground protection as a means of shock protection.
The following symbol is used to indicate a protective conductor terminal in the unit.
Disconnecting from Line Power
Some of the circuits are powered whenever the unit is connected to the AC power source (line
power). To ensure that the unit is not connected to the line power, disconnect the power cord
from either the power inlet on the unit’s rear panel or from the AC line-power source
(receptacle). The power cord must always be accessible from one of these points. If the unit is
installed in a cabinet, the operator must be able to disconnect the unit from the line power by
the system’s line-power switch.
Line Power Requirements
The unit can operate from any single-phase AC power source that supplies between 100 and
240 V at a frequency range of 50 to 60 Hz. The maximum power consumption is 100 VA.
Fuse Type
The fuse type used by the unit is (5x20) mm, T1A/250 V (slow).
Laser Application
Warning
The unit is rated as a system for use with laser equipment. The laser class of
any unit connected to the SCG unit applies to the SCG unit. Follow appropriate
laser safety procedures for that class.
Safety – 1

Safety Instructions
The following safety instructions must be observed whenever the unit is operated, serviced, or
repaired. Failure to comply with any of these instructions or with any precaution or warning
contained in the user’s manual is in direct violation of the standards of design, manufacture, and
intended use of the unit. JDS Uniphase assumes no liability for the customer’s failure to comply
with any of these safety requirements.
Before Initializing and Operating the Unit
Inspect the unit for any signs of damage, and read the user’s manual thoroughly.
Install the unit as specified in the Getting Started section.
Ensure that the unit and any devices or cords connected to it are properly grounded.
Operating the Unit
Warning
To avoid the risk of injury or death, always observe the following precautions
before initializing the unit:
• When using a voltage-reducing autotransformer to power the unit, ensure
that the common terminal connects to the earthed pole of the power source.
• Use only the type of power cord supplied with the unit.
• Connect the power cord only to a power outlet equipped with a protective
earth contact. Never connect to an extension cord that is not equipped with
this feature.
• Do not interrupt the protective earth grounding. Any such action can lead to
a potential shock hazard that can result in serious personal injury.
• Do not operate the unit if an interruption to the protective grounding is
suspected. In this case, ensure that the unit remains inoperative.
• Willfully interrupting the protective earth connection is prohibited.
• Never look into the end of an optical cable connected to an optical output
device that is operating. Laser radiation is invisible, and direct exposure can
severely injure the human eye. For more information, see the user’s manual
of the laser source in use.
• Turning off the power to the device does not always block the externally
supplied radiation to the connector at the output of the unit.
• Do not use the unit outdoors.
• To prevent potential fire or shock hazard, do not expose the unit to any
source of excessive moisture.
• Use only the type of fuse specified by the manufacturer as appropriate for
this unit. Do not use repaired fuses, and avoid any situations that can short-
circuit the fuse.
• Do not operate the unit when its covers or panels have been removed.
Safety – 2

• Unless absolutely necessary, do not attempt to adjust or perform any
maintenance or repair procedure when the unit is opened and connected to
a power source.
• Repairs are to be carried out only by a qualified professional.
• Do not attempt any adjustment, maintenance, or repair procedure to the
unit’s internal mechanism if immediate first aid is not accessible.
• Disconnect the power cord from the unit before adding or removing any
components.
• Operating the unit in the presence of flammable gases or fumes is extremely
hazardous.
• Do not perform any operating or maintenance procedure that is not
described in the user’s manual.
• Some of the unit’s capacitors can be charged even when the unit is not
connected to the power source.
Safety Symbols
The following symbols and messages can be marked on the unit (Table 1). Observe all safety
instructions that are associated with a symbol.
Table 1: Safety Symbols
Symbol Description
Laser safety. See the user’s manual for instructions on handling and operating
the unit safely.
See the user’s manual for instructions on handling and operating the unit safely.
Electrostatic discharge (ESD). See the user’s manual for instructions on
handling and operating the unit safely.
Frame or chassis terminal for electrical grounding within the unit.
Protective conductor terminal for electrical grounding to the earth.
(table continued)
Safety – 3

Symbol Description
WARNING
The procedure can result in serious injury or loss of life if not carried out
in proper compliance with all safety instructions. Ensure that all
conditions necessary for safe handling and operation are met before
proceeding.
CAUTION
The procedure can result in serious damage to or destruction of the unit if not
carried out in compliance with all instructions for proper use. Ensure that all
conditions necessary for safe handling and operation are met before
proceeding.
Compliance
FCC Compliance
The Federal Communications Commission (FCC) of the United States of America requires that
equipment operating in that country does not cause interference to communications. The unit
has been tested and found to comply with the limits for a Class A digital device, pursuant to Part
15 of Title 47 of the Code of Federal Regulations for Radio Frequency Devices. Operation is
subject to the following two conditions, which the FCC requires to be labeled on the unit:
• This device may not cause harmful interference.
• This device must accept any interference received, including interference that may cause
undesired operation.
FCC rules require that the following note and subsequent information be included in this
manual:
Note: This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely
to cause harmful interference in which case the user will be required to correct the interference
at his own expense.
These limits are designed to provide reasonable protection against harmful interference in a
commercial installation. The unit generates, uses, and radiates radio frequency energy and, if
not installed and used in accordance with instructions, can cause harmful interference to radio
communications.
Any user modification made to the unit voids the user’s authority to operate the unit under the
FCC rules.
If this unit is used in a residential setting, resulting interference must be corrected by the user.
For more information, see Title 47 of the Code of Federal Regulations at
http://www.access.gpo.gov/nara/cfr/cfr-table-search.html.
Safety – 4

CE Compliance
The unit has been designed and tested to comply with directive 73/23/EEC and its subsequent
amendments by the European Community (EC or CE). The directive relates to electrical
equipment designed for use within certain voltage limits. It ensures that electrical equipment is
constructed with good engineering practice in safety matters.
The unit has been designed and tested to comply with directive 89/336/EEC and its subsequent
amendments. The directive relates to electromagnetic compatibility. It demands that
electromagnetic disturbance does not exceed a prescribed level; that the equipment be immune
to a prescribed level of ambient level of interference; that the equipment be protected against
electrostatic discharges; and that the equipment be immune to all electrical shock wave
disturbances. As of 1997, measures have been added to test for fire hazard, electric shock
hazard, and also external exposure to other forms of energy.
The requirements specified by directive 89/336/EEC are as follows. CE compliance requires
that the manufacturer or its authorized representative established within the Community affix the
EC conformity mark to the apparatus or else to the packaging, instructions for use, or guarantee
certificate. The EC conformity mark shall consist of the letters CE as specified and the figures of
the year in which the mark was affixed. This mark should, where appropriate, be accompanied
by the distinctive letters used by the notified body issuing the EC type-examination certificate.
Where the apparatus is the subject of other Directives providing for the EC conformity mark, the
affixing of the EC mark shall also indicate conformity with the relevant requirements of those
other Directives.
CSA / IEC Compliance
The unit complies with certain standards of the Canadian Standards Association (CSA) and the
International Electrotechnical Commission (IEC).
The unit is in Installation Category (Overvoltage Category) II under IEC 664. IEC 664 relates to
impulse voltage levels and insulation coordination. The particular category is defined as: local
level, appliances, portable equipment, etc, with smaller transient overvoltages than Installation
Category (Overvoltage Category) III.
The unit is in the Pollution Degree 2 category under IEC 1010-1 and CAN/CSA-C22.2 No.
1010.1. The IEC standard on Safety Requirements for Electrical Equipment for Measurement,
Control, and Laboratory Use relates to insulation coordination. The CSA standard is on Safety
Requirements for Electrical Equipment for Measurement Control, and Laboratory Use, Part I:
General Requirements. The Pollution Degree 2 category is defined as follows: “Normally only
non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused by
condensation must be expected.”
UL1Compliance
The unit complies with Underwriters Laboratories (UL) standard 1950, the Standard for Safety
Information Technology Equipment.
1UL is a registered trademark of Underwriters Laboratories Inc.
Safety – 5

General Information and Specifications
General Information
This user’s manual for the SCG Series Fiberoptic Switch contains complete operating
instructions.
The SCG Series Fiberoptic Switch is a programmable switch (Figure 1) that aligns multiple
inputs with multiple outputs. Performance, configuration, and flexibility are suitable for a wide
range of applications, including fiberoptic component testing systems, remote fiber test systems
in telecommunications, and research and development.
Figure 1: SCG Switch
The SCG switch connects a selected input to a selected output channel. The terminations are
precisely aligned using a processor-controlled stepper motor. Collimating lenses terminate the
fiberoptic attachments, minimizing the insertion loss of the switch and improving the
repeatability and stability of its parameters.
The SCG switch is equipped with an IEEE2488.1 parallel interface and an RS232C serial
interface for remote control operation. The switch is operated manually using the front-panel
controls.
The SCG switch is available in multiple-common (SCG-D, SCG-E, and SCG-F) configurations.
The multiple-common units support many grouped fiberoptic input channels.
2IEEE is a registered trademark of the Institute of Electrical and Electronics Engineers. Inc.
General Information and Specifications – 6

Multiple-Common (SCG-D) Switch Configuration
The multiple-common (SCG-D) switch configuration provides simultaneous connection of a
bank of inputs to outputs (Figure 2). Input 1 can be connected to 1-1 or any 1-M/N output. In this
configuration, channel connections are stepped by groups. The number of states is equal to the
number of output channels divided by the number of input channels.
2-1
2-2
2-3
.
M-M/N
.
.
M-2
1-2
1-3
1-M/N
.
.
1-1
M-1
M-3
.
.
2-M/N
1
2
M
3
4
5
.
.
Figure 2: Multiple-Common Configuration for MxN Channels
Single-Step Multiple-Common (SCG-E) Switch Configuration
The non-blocking single-step multiple-common (SCG-E) configuration allows any input to be
connected to any output. At the same time, adjacent inputs align with adjacent outputs (Figure
3). This configuration allows for single-step movement of any input channel to any output
channel.
1
N
1
2
3
M
R
R
R
R
R
.
.
2
3
4
5
6
7
8
.
.
.
.
.
.
.
4
Figure 3: Single-Step Multiple-Common Configuration for MxN Channels
General Information and Specifications – 7

Multiple-Common Blocking (SCG-F) Switch Configuration
In the multiple-common blocking (SCG-F) configuration, any input can be aligned to any output,
and the inputs not used are blocked (Figure 4).
1
2
N
1
2
.
M
.
R
R
R
R
Figure 4: Multiple-Common Blocking Configuration for MxN Channels
Key Features
• Up to 180 channels
• Typical insertion loss of 0.3 dB
• Typical repeatability of 0.005 dB
• Typical return loss greater than 65 dB
• Local and remote control using IEEE 488 and RS232C interfaces
• Single-height, rack-mounted unit
Applications
• Fiberoptic component testing
• Transmitter and receiver measurement
• Research and development
Standard Accessories
• AC power cord
• User’s manual
General Information and Specifications – 8

Specifications
The following optical specifications describe the warranted characteristics of the unit (Table 2).
Supplementary specifications describe the typical non-warranted performance of the unit (Table
3 and Table 4).
Table 2: Optical Specifications
Typical MaximumParameter
SCG-D SCG-E
SCG-F
SCG-D SCG-E
SCG-F
Insertion loss
single-mode1
multimode1
0.5 dB
0.5 dB
0.7 dB
0.7 dB
1.0 dB
1.0 dB
1.5 dB
1.5 dB
Return loss
single-mode2standard/analog
multimode2standard/analog
65 dB
25 dB
65 dB
25 dB
60 dB
20 dB
60 dB
20 dB
Polarization dependent loss (single-mode) 0.02 dB 0.03 dB 0.05 dB 0.07 dB
Insertion loss stability3±0.03 dB ±0.05 dB
Repeatability4
sequential switching
random switching
±0.005 dB
±0.02 dB
±0.01 dB
±0.04 dB
Crosstalk (single-mode) -90 dB -80 dB
Input power (continuous wave) 300 mW N/A
Channel options
front or rear panel connectors
front or rear panel pigtail
60 (maximum)
90 (maximum)
Switching time
one channel
each additional channel
420 ms (typical)
+20 ms (typical)
1Insertion loss does not include connectors. Include 0.2 dB (typical), 0.5 dB (maximum) for each
connector.
2 Excluding connectors.
3Drift of any channel relative to one assigned reference channel at ±3 °C deviation of ambient
temperature over a seven-day period.
4 Optimum repeatability after one hour warm-up.
General Information and Specifications – 9

Table 3: Operating Specifications
Parameter Description
Local control • Step-up, step-down channel selection
• Control of eight relay drivers
• IEEE 488.1 address selection
• Return-to-local function
• Language selection
Remote control • GPIB interface:
IEEE 488.1 1987 capability SH1, AH1, T6, L4, SR1, PP0, DC1, C0, E1
• RS232C interface:
setting 8 bits, 9600 baud, 1 stop bit, no parity
Command set Revised command set
Drivers Eight open collector outputs, sink current 100 mA maximum per output (driver):
• Drivers 1, 2, 3, 4, +5 V and GND (ground) are accessible from back panel
connector
• Drivers 5, 6, 7, and 8 are internal
Warm-up time11 hour at 25 °C ambient temperature
1Applicable for optimum repeatability performance.
Table 4: Other Specifications
Electrical
Input voltage 100 to 240 V AC, 50 to 60 Hz
Power consumption 100 VA maximum
Physical
Dimensions (W x H x D)
single-height with rack mount 48 x 13.25 x 38 cm
Weight 9 kg
Environmental
Operating temperature 0 to 55 °C
Storage temperature -40 to 70 °C
Humidity (non-condensing) Maximum 95% RH from 0 to 55 °C
General Information and Specifications – 10

Getting Started
The SCG Series Fiberoptic Switch consists of the rack-mounted switch unit and a power cord.
Before Initializing and Operating the Unit
Inspect the unit for any signs of damage.
 Read the user’s manual thoroughly, and become familiar with all safety symbols and
instructions to ensure that the unit is operated and maintained safely.
Initial Inspection
Warning
To avoid electrical shock, do not initialize or operate the unit if it bears any sign
of damage to any portion of its exterior surface, such as the outer cover or
panels.
Check that the unit and contents are complete:
1. Wear an anti-static wrist strap, and work in an electrostatic discharge (ESD) controlled area.
2. Inspect the shipping container for any indication of excessive shock to the contents, and
inspect the contents to ensure that the shipment is complete.
3. Inspect the unit for structural damage that can have occurred during shipping.
4. Ensure that the power switch is set to O(off).
5. Connect the unit to a power source, using the AC power cord provided.
6. Set the power switch to I(on). All key lamps and status LEDs light. The unit designation and
the firmware version are displayed. If no malfunction is detected during power-up, all lamps
and LEDs turn off and the display reads the switch number and channel connection status. If
a malfunction is detected during the power-up sequence, an error message is displayed.
7. Set the power switch to O(off) and disconnect the AC power cord from the power supply
and from the SCG switch.
8. Keep the packaging.
Immediately inform JDS Uniphase and, if necessary, the carrier if the contents of the shipment
are incomplete, if the unit or any of its components are damaged or defective, or if the unit does
not pass the initial inspection.
Getting Started – 11

Operating Environment
In order for the unit to meet the warranted specifications, the operating environment must meet
the following conditions for temperature, humidity, and ventilation.
Temperature
The unit can be operated in the temperature range of 0 to 55 °C.
Humidity
The unit can be operated in environments with up to 95% humidity (0 to 55 °C). Do not expose it
to any environmental conditions or changes to environmental conditions that can cause
condensation to form inside the unit.
Ventilation
The unit contains a built-in cooling fan. Do not install it in any location where the ventilation is
blocked. For optimum performance, the unit must be operated from a location that provides at
least 75 mm (3 in) of clearance at the rear and at least 25 mm (1 in) of clearance at the bottom.
Blocking the air circulation around the unit can cause the unit to overheat, compromising its
reliability.
Warning
• Do not use the unit outdoors.
• To prevent potential fire or shock hazard, do not expose the unit to any
source of excessive moisture.
Storing and Shipping
To maintain optimum operating reliability, do not store the unit in locations where the
temperature falls below -40 °C or rises above 70 °C. Avoid any environmental condition that can
result in internal condensation. Ensure that these temperature and humidity requirements can
also be met whenever the unit is shipped.
Claims and Repackaging
Immediately inform JDS Uniphase and, if necessary, the carrier, if
• The contents of the shipment are incomplete
• The unit or any of its components are damaged or defective
• The unit does not pass the initial inspection
In the event of carrier responsibility, JDS Uniphase will allow for the repair or replacement of the
unit while a claim against the carrier is being processed.
Returning Shipments to JDS Uniphase
JDS Uniphase only accepts returns for which an approved Return Material Authorization (RMA)
has been issued by JDS Uniphase sales personnel. This number must be obtained prior to
shipping any material to JDS Uniphase. The owner’s name and address, the model number and
Getting Started – 12

full serial number of the unit, the RMA number, and an itemized statement of claimed defects
must be included with the return material.
Ship return material in the original shipping container and packing material. If these are not
available, packaging guidelines are as follows:
1. Wear an anti-static wrist strap and work in an ESD controlled area.
2. Wrap the unit in anti-static packaging. Use anti-static connector covers, if applicable.
3. Pack the unit in a reliable shipping container.
4. Use enough shock-absorbing material (10 to 15 cm or 4 to 6 in on all sides) to cushion the
unit and prevent it from moving inside the container. Pink poly anti-static foam is the best
material.
5. Seal the shipping container securely.
6. Clearly mark FRAGILE on its surface.
7. Always provide the model and serial number of the unit and, if necessary, the RMA number
on any accompanying documentation.
8. Ship the unit only to the address given at the beginning of this document.
Cleaning Connectors
Caution
• Connecting damaged or dirty fibers to the unit can damage the connectors
on the unit.
• Never force an optical connector. Some connectors have a ceramic ferrule
that can easily be broken.
Optical cable ends need to be cleaned before using them with the unit.
The following items are required for cleaning:
• Filtered compressed air or dusting gas (for example, Tech Spray Envi-Ro-Tech Duster 1671
gas, available from http://www.techspray.com/1671.htm)
• Lint-free pipe cleaners (for example, from 3M3) or lint-free swab
• Lint-free towels (for example, 10 x 10 cm or 4 x 4 in HydroSorb III wipers, available from
http://www.focenter.com/acctech/hydrosobr_wipers.htm)
• Optical grade isopropyl alcohol or optical grade 200° ethanol (do not use rubbing alcohol,
which contains 30% water)
33M is a trademark of 3M.
Getting Started – 13

To clean the connectors:
1. Blow the sleeve with filtered compressed air (Figure 5).
Figure 5: Connector Cleaning (connector type can vary)
2. Apply optical grade isopropyl alcohol or optical grade ethanol (do not use rubbing alcohol) to
a small area of a lint-free towel and rub the end of the ferrule over the wet area.
3. Wipe the ferrule on a dry area of the lint-free towel.
4. Using the dusting gas or compressed air, blow the end of the ferrule.
5. Apply the alcohol or ethanol to a lint-free pipe cleaner or swab and wipe off the remaining
parts of the connector.
6. With the other end of the pipe cleaner or swab, dry the areas cleaned.
7. Using the dusting gas or compressed air, blow the areas cleaned.
Installing the Switch
Caution
In sensitive applications, to avoid shock and vibration, do not mount the switch
in non-rigid racks or on top of raised floors or tables. Avoid use with high-
impact doors that lack impact-reducing bumpers upon closing.
To install the switch:
1. Place the SCG switch in its intended operating location. The rack-mounting flanges fully
support the weight of the switch. Avoid blocking the ventilation holes at the back and at the
bottom of the instrument.
2. Route the fiber cables in such a way as to avoid creating bends that have a radius of less
than 1.5 cm; do not lay cables across sharp corners or tie bundles of cables together tightly.
Do not pull on the fibers that exit through the rear-panel strain relief. Excessive force can
damage the optics.
3. Reattach the AC power cord and reinitialize the switch.
Getting Started – 14

Operating and Maintenance Instructions
Front Panel
The front of the unit is shown in Figure 6. A close-up of the key panel is shown in Figure 7.
Figure 6: Front of Switch
Figure 7: Operating Keys and Status LEDs
Operating and Maintenance Instructions – 15

Operating Keys
The operating keys are described in Table 5.
Table 5: Operating Keys
Key Description
I /O Power on (I) and off (O) switch
GPIB ADDR Sets the switch to GPIB Address (IEEE 488.1) mode
LOCAL Returns the switch to Local mode from Remote mode, unless the switch is
in Local Lockout mode
RELAY Sets the switch to Relay (driver control) mode
STORE Stores relay driver patterns in non-volatile memory
RECALL Recalls a stored driver pattern
CHANNEL Sets the switch to Channel Control mode
▲Channel increment key
▼Channel decrement key
(0 to 9) Numeric entry key pad
ENTER Terminates an entry, such as the channel number or GPIB address
Status LEDs
The status LEDs are described in Table 6.
Table 6: Status LEDs
LED Description
REM Indicates that the GPIB or RS232 interface is in Remote mode. All front-panel
keys except Local are locked out.
LOCK Indicates that the switch is in Local Lockout mode. This mode prevents the
Local key from returning the switch to Local mode.
ADDR Indicates that the GPIB interface is in talk or listen state
SRQ Indicates that the interrupt logic of the switch has generated a service request
interrupt on the GPIB interface
(1 to 8) Indicates the on/off state of the relay drivers (driver is on when LED is lit and
off when LED is dark)
Operating and Maintenance Instructions – 16

Rear Panel
The back of the unit is shown in Figure 8.
Figure 8: Back of Switch
Making External Switch Module Connections
External Switch Module without TTL Input Controls
The setup for a switch without transistor-to-transistor logic (TTL) is shown in Figure 9.
Figure 9: Switch Setup without TTL
Operating and Maintenance Instructions – 17