Racal Instruments 1260-38T User manual

1260 VXI
SWITCHING CARD
1260-38T
MULTIPLEXER / SCANNER
PUBLICATION NO. 980673-042
RACAL INSTRUMENTS
United States
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PUBLICATION DATE: August 30, 2004
Copyright 1998 by Racal Instruments, Inc. Printed in the United States of America. All rights reserved.
This book or parts thereof may not be reproduced in any form without written permission of the publisher.

THANK YOU FOR PURCHASING THIS RACAL INSTRUMENTS PRODUCT.
For this product, or any other Racal Instruments product that incorporates software drivers, you may access
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WARRANTY STATEMENT
All Racal Instruments, Inc. products are designed and manufactured to exacting standards and in full
conformance to Racal’s ISO 9000/2000 procedures.
This warranty does not apply to defects resulting from any modification(s) of any product or part without Racal
Instruments express written consent, or misuse of any product or part. The warranty also does not apply to
fuses, software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal
wear, such as mechanical relay life, or failure to follow instructions.
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty of
merchantability or fitness for a particular use. The remedies provided herein are buyer’s sole and exclusive
remedies.
For the specific terms of your standard warranty, or optional extended warranty or service agreement, contact
your Racal customer service advisor. Please have the following information available to facilitate service.
1. Product serial number
2. Product model number
3. Your company and contact information
You may contact your customer service advisor by:
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RETURN of PRODUCT
Authorization is required from Racal Instruments before you send us your product for service or calibration.
Call your nearest Racal Instruments support facility. A list is located on the last page of this manual. If you are
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at 1-800-722-3262 or 1-949-859-8999 or via fax at 1-949-859-7139. We can be reached at:
[e-mail].
PROPRIETARY NOTICE
This document and the technical data herein disclosed, are proprietary to Racal Instruments, and shall not,
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a competitive source or used for manufacture by anyone other than Racal Instruments. The information herein
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DISCLAIMER
Buyer acknowledges and agrees that it is responsible for the operation of the goods purchased and should
ensure that they are used properly and in accordance with this handbook and any other instructions provided
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FOR YOUR SAFETY
Before undertaking any troubleshooting, maintenance or exploratory procedure, read carefully the
WARNINGS and CAUTION notices.
This equipment contains voltage hazardous to
human life and safety, and is capable of
inflicting personal injury.
If this instrument is to be powered from the AC line (mains) through an
autotransformer, ensure the common connector is connected to the neutral (earth
pole) of the power supply.
Before operating the unit, ensure the conductor (green wire) is connected to the
ground (earth) conductor of the power outlet. Do not use a two-conductor extension
cord or a three-prong/two-prong adapter. This will defeat the protective feature of the
third conductor in the power cord.
Maintenance and calibration procedures sometimes call for operation of the unit with
power applied and protective covers removed. Read the procedures and heed
warnings to avoid “live” circuit points.
Before operating this instrument:
1. Ensure the proper fuse is in place for the power source to operate.
2. Ensure all other devices connected to or in proximity to this instrument are properly grounded or
connected to the protective third-wire earth ground.
If the instrument:
- fails to operate satisfactorily
- shows visible damage
- has been stored under unfavorable conditions
- has sustained stress
Do not operate until, performance is checked by qualified personnel.

i
Table of Contents
Chapter 1...........................................................................................................................1-1
MODULE SPECIFICATION .........................................................................................................1-1
Introduction ..............................................................................................................................1-1
1260-38T Module Specification ................................................................................................1-2
Ordering Information ................................................................................................................1-4
Safety.......................................................................................................................................1-4
Product Support ...................................................................................................................... 1-4
Chapter 2...........................................................................................................................2-1
INSTALLATION INSTRUCTIONS................................................................................................2-1
Unpacking and Inspection ........................................................................................................2-1
Reshipment Instructions...........................................................................................................2-1
Option 01 Installation................................................................................................................2-1
Module Installation....................................................................................................................2-2
1260-38 ID Byte ...................................................................................................................... 2-2
Chapter 3...........................................................................................................................3-1
MODULE OPERATION................................................................................................................3-1
Module Configuration ...............................................................................................................3-1
Two-Wire Operation..............................................................................................................3-2
Four-Wire Operation .............................................................................................................3-2
Front Panel Connectors ........................................................................................................3-2
Mating Connectors................................................................................................................3-3
1260-38T Module Specific Syntax ............................................................................................3-3
Syntax...................................................................................................................................3-4
CLOSE Command.............................................................................................................3-5
OPEN Command...............................................................................................................3-5
PDATAOUT Command .....................................................................................................3-5
PSETUP Command ......................................................................................................... 3-6

ii
Chapter 4...........................................................................................................................4-1
DRAWINGS.................................................................................................................................4-1
Chapter 5...........................................................................................................................5-1
PARTS LIST ................................................................................................................................5-1
Chapter 6...........................................................................................................................6-1
PRODUCT SUPPORT.................................................................................................................6-1
Product Support .......................................................................................................................6-1
Reshipment Instructions...........................................................................................................6-1
Support Offices ........................................................................................................................6-2

iii
List of Figures
Figure 1-1, 1260-38T Multiplexer / Scanner ................................................................................ 1-1
Figure 3-1, 1260-38T Module Configuration Block Diagram........................................................ 3-7
Figure 3-2, 1260-38T Multiplexer Configuration Block Diagram .................................................. 3-8
Figure 3-3, 1260-38T Pin Connections, Front View..................................................................... 3-9
List of Table
Table 3-1, 1260-38T Channel Number/Connector Pin/Cable Mapping...................................... 3-10

iv
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1260-38T User Manual
Racal Instruments © 1998 Module Specification 1-1
Chapter 1
MODULE SPECIFICATION
Introduction The 1260-38T 1 x 128 Two-Wire Scanner/Multiplexer Module
consists of eight pairs of 1 x 8 multiplexers. These eight pairs of
multiplexers, in conjunction with interconnecting relays, allow the
1260-38T module to be configured as:
- One 1 x 64 Four-wire multiplexer
- One 1 x 128 Two-wire multiplexer
In addition, each pair of 1 x 8 multiplexers can be independently
configured as:
- Two 1 x 8 Two-wire multiplexers
- One 1 x 16 Two-wire multiplexer
- One 1 x 8 Four-wire multiplexer
Figure 3-1, 1260-38 Module Configuration Block Diagram, and
Figure 3-2, 1260-38 Multiplexer Configuration Block Diagram,
shows a diagrammatic representation of the switch module and
multiplexer pair, respectively.
Figure 1-1, 1260-38T Multiplexer / Scanner

1260-38T User Manual
Module Specification 1-2 Racal Instruments © 1998
1260-38T Module
Specification
Maximum Switch Power 125VA, 60W
Maximum Switch Voltage 250VAC, 220VDC
Maximum Switch Current 2A AC, 2A DC
Bandwidth (50W)
1 x 8 Configuration >30MHz
1 x 16 Configuration >30MHz
1 x 128 Configuration >2MHz
Insertion Loss (50W)
1 x 8 Configuration <2dB to 10MHz
Crosstalk (50W)
1 x 8 Configuration <-50dB to 10MHz
Isolation (50W)
1 x 8 Configuration >45dB to 10kMHz
Path Resistance
1 x 8 Configuration <0.75W
1 x 128 Configuration <1.0W
Thermal EMF
1 x 8 Configuration <15mV
1 x 128 Configuration <20mV
Impedance
High-Low > 2000MW
High-Chassis > 2000MW
Low to Chassis > 2000MW
Capacitance
Channel to Chassis (1 x 8) <5pF
Channel to Chassis (1 x 128) <5pF
High to Low (1 x 8) <120pF
High to Low (1 x 128) <600pF

1260-38T User Manual
Racal Instruments © 1998 Module Specification 1-3
Temperature
Operating 00C to+550C
Non-Operating -400C to +710C
Relative Humidity
95+1-5% RH Non-Condensing <30'C
75+1-5 %RH > 300C
45+1-5 %RH > 400C
Altitude
Operating 10,000 ft
Non-Operating 15,000ft
Vibration 0.013" double amplitude,
5-55Hz
Shock, functional 30g, 11msec, ½ sine wave
Bench Handling 4inch drop
Cooling Requirement
Without Option 01 installed
Airflow 2.0 liters/sec
Backpressure 0.05mm H20
With Option 01 installed
Airflow 3.0 liters/sec
Backpressure 0.2mm H20
Power Requirement
Without Option 01 installed
+5V Static Current, Ipm 0.4A
+5V Dynamic Current, Idm 0.075A
With Option 01 installed
+5V Static Current, Ipm 2.5A
+5V Dynamic Current, Idm 0.225A
+24V Static Current, Ipm 6mA per energized relay
+24V Dynamic Current, Idm 0A
Weight
Without Option 01 installed 3.21b (1.45kg)
With Option 01 installed 3.51b (1.60kg)
Minimum Option 01 Firmware Revision 28.1

1260-38T User Manual
Module Specification 1-4 Racal Instruments © 1998
Ordering
Information
Listed below are part numbers for both the 1260-38T Switch Module
and available mating connector.
Model Numbers Description Part #
1260-38T Switch Module 1260-38T, 2w, 1 x 128 sc mux, 2 amp 407410-001
160-Pin Mating Connector 160-Pin Conn. Kit w/backshell and pins 407407
Cable Assy, 6ft, sleeved 160-Pin Cable Assy, 6ft, 24GA 407408
Cable Assy, 12ft, sleeved 160-Pin Cable Assy, l2ft, 24GA 407409
Safety Refer to the "FOR YOUR SAFETY" page preceding the Table of
Contents. Follow all NOTES, CAUTIONS and WARNINGS to
ensure personal safety and prevent damage to the instrument.
Product Support Racal Instruments has a complete Service and Parts Department.
If you need technical assistance or should it be necessary to return
your product for servicing, call 1-800-722-3262.
If parts are required to repair the product at your facility, call 1-
800-722-3262 and ask for the Parts Department.
When sending your instrument in for repair, complete the form in
the back of this manual

1260-38T User Manual
Racal Instruments © 1998 Installation Instructions 2-1
Chapter 2
INSTALLATION INSTRUCTIONS
Unpacking and
Inspection
1. Before unpacking the switching module, check the exterior
of the shipping carton for any signs of damage. All
irregularities should be noted on the shipping bill.
2. Remove the instrument from its carton, preserving the
factory packaging as much as possible.
3. Inspect the switching module for any defect or damage.
Immediately notify the carrier if any damage is apparent.
4. Have a qualified person check the instrument for safety
before use.
Reshipment
Instructions
1. Use the original packing when returning the switching module
to Racal Instruments for calibration or servicing. The original
shipping carton and the instrument's plastic foam will provide
the necessary support for safe reshipment.
2. If the original packing material is unavailable, wrap the
switching module in an ESD Shielding bag and use plastic
spray foam to surround and protect the instrument.
3. Reship in either the original or a new shipping carton.
Option 01
Installation
Installation of the Option 01 to the 1260-38T is described in the
Installation Section of the 1260 Series VXIbus Switching Cards
Manual.

1260-38T User Manual
Installation Instructions 2-2 Racal Instruments © 1998
Module
Installation
Installation of the 1260-38T Switching Module into a VXI
mainframe, including the setting of switches SW1-1 through SW1-
4, SW2 and SW3, is described in the Installation section of the
1260 Series VXI Switching Cards Manual. Configuration of
switches SW 1-5 and SW 1-6 is described below.
1260-38 ID Byte Refer to Section 2 of the Series 1260 VXI Switching Card Manual
for an explanation of Module ID Byte.
The 1260-38T may be configured for two-wire or four wire
switching. The two-wire configuration closes one relay for the
selected channel. Four-wire configuration closes two relays for the
selected channel. Each configuration responds to different sets of
values for <channel number>. The set of values the 1260-38T
responds to is controlled by switch SW1- 5. The switch settings
that correspond to the two configurations are as follows:
Configuration* S1 Switch 5 S1 Switch 6
Two-wire Off Off
Four-wire On Off
The 1260-38T is set at the factory for two-wire configuration.
NOTE
*The software will report the Model Number as “1260-
38A” for the two-wire configuration, or “1260-38B” for
the four-wire configuration.

1260-38T User Manual
Racal Instruments © 1998 Module Operation 3-1
Chapter 3
MODULE OPERATION
Module
Configuration
The 1260-38T is a 1 x 128 Two-Wire Scanner/Multiplexer Module
consisting of eight pairs of 1 x 8 multiplexers. These eight pairs of
multiplexers, in conjunction with interconnecting relays, allow the
1260-38T module to be configured as:
- One 1 x 64 Four-wire multiplexer
- One 1 x 128 Two-wire multiplexer
Each pair of 1 x 8 multiplexers can he independently configured
as:
- Two 1 x 8 Two-wire multiplexers
- One 1 x 16 Two-wire multiplexer
- One 1 x 8 Four-wire multiplexer
Reference should be made to Figure 3-1, 1260-38T Module
Configuration Block Diagram, and Figure 3-2, 1260-38T
Multiplexer Configuration Block Diagram.
The multiplexer pairs consist of two 1 x 8 multiplexers, giving a
total of sixteen 1 x 8 multiplexers (00 through 15). Each 1 x 8
multiplexer consists of one two-wire common and eight two-wire
channels. The channels are numbered 0000 to 0007 for
multiplexer 00, through 0150 to 0157 for multiplexer 15.
Interconnecting relays (channels 1002, 2002, ....8002) join the
multiplexers to form multiplexer pairs. The multiplexer pairs are
formed by multiplexers 00-01, 02-03, 04-05, 06-07, 08-09, 10-11,
12-13, and 14-15.
The multiplexer pairs are joined to each other through seven more
pairs of interconnecting relays (1000, 1001,2000, 2001, …7000,
7001). This allows pairs of the module to be configured for four-
wire operation.

1260-38T User Manual
Module Operation 3-2 Racal Instruments © 1998
Two-Wire
Operation
Two-wire configuration gives the most flexibility as it allows all
channels (0000 through 0157, 1000 through 8000, and 9000
through 9007) to be selected.
Interconnecting relays (1000, 1001, 2000, 2001, …..7000, 7001)
permit linking of all the 1 x 8 multiplexers to give configurations
from sixteen 1 x 8 multiplexers up to one 1 x 128 multiplexer.
Example: Make a two-wire 1 x 32 using multiplexes 00,01,02,03
Close channels 1000, 1002 and 2002.
Four-Wire
Operation
Four-wire configuration permits four-wire closures only. Only even-
numbered multiplexers (00, 02, ….14) may be selected. Closing a
channel in an even-numbered multiplexer also closes the
equivalent channel in the adjacent odd-numbered multiplexer. For
example, closing Channel 0002 (channel 2 of multiplexer 00) will
also close channel 0012 (channel 2 of multiplexer 01).
The same applies to the interconnect relays (channels 1000, 1001,
2000, 2001, …..7000, 7001). Closing channel 1000 will also close
channel 1001. In four-wire operation, the interconnect relays
permit configurations of eight 1 x 8 multiplexers up to one 1 x 64
multiplexer.
Example: Make a four-wire 1 x 24 using multiplexers 00, 01, 02,
03, 04, 05
Close channels 1000 and 2000.
Front Panel
Connectors
The 1260-38T front panel connectors are labeled J200 and J201.
The connector type is 5 x 32 (160-pin) DIN 41 612 male. The pin
numbering is shown in Figure 3-3.
The mapping of channel numbers to connector pins and the
available mating connector cable is given in Table 3-1.

1260-38T User Manual
Racal Instruments © 1998 Module Operation 3-3
Mating
Connectors
There are no mating connectors shipped with the 1260-38T
module. Racal Instruments offers the following accessories for
mating connectors (see ordering information for part numbers):
-160-Pin Connector Kit with backshell and pins
-160-Pin Cable Assy, 6ft, 24GA
-160-Pin Cable Assy, 12ft, 24GA
The 160-Pin Connector kit consists of a connector housing,
customized backshell and 170 crimp pins. The backshell design
has been optimized for system integration. The connector kit has
been designed for 22 to 26 gauge cable. The crimp pin will lock or
'click' into the connector housing only when installed correctly. The
assembler should ensure that the crimp pin is locked by tugging
on the cable after insertion.
The hand crimp tool for loose crimp contacts is Erni Part Number
014 374. The disassembly tool is Erni Part Number 471 555.
The cable assemblies (optional lengths of 6ft. or 12ft.) use the
160-Pin Connector kit along with two 80-wire multi-colored 24
gauge cables. One end is un-terminated. Refer to Table 3.1 for the
mapping of channels to connector and cable.
1260-38T Module
Specific Syntax
The Module Specific Syntax for the 1260-38T is required in the
use of the OPEN and CLOSE commands. It will also appear in
data output by the Master in response to the PDATAOUT and
PSETUP commands.

1260-38T User Manual
Module Operation 3-4 Racal Instruments © 1998
Syntax The Module Specific Syntax for the 1260-38T Multiplexer/Scanner
module is as follows:
<COMMAND> <relay designator> [;<relay designator>]
where:
<relay designator> ::= <module address>.<channel range>
[,<channel range>...]
<channel range> ::= <channel descriptor>[-<channel descriptor>]
<channel descriptor> ::= <interconnect><mux select><channel>
<module address> ::= 1.. 12
<interconnect> ::= 0 to 9
Where: 0 = multiplexer channels.
1 to 8 = multiplexer interconnect relays.
<mux select> ::= 00 to 15
For two-wire mode: selects one of 16 1 x 8 multiplexers.
For four-wire mode: selects two of 16 1 x 8 multiplexers.
Only even number multiplexers are allowed. Selecting
multiplexer 00 will also select same channel on next
multiplexer in sequence, in this case multiplexer 01.
<channel> ::= 0 to 7
0 to 7 for multiplexers
0 to 2 for interconnect relays
NOTE
The <module address> used here is not the VXIbus
defined Logical Address of the 1260 Series Master. It
is unique to the 1260 Series and describes the
switching module in relation to the Master. This
address corresponds to the binary value of the switch
setting of SW1 on the switching module PCB. Refer
to the Installation Section of the 1260 Series VXI
Switching Cards Manual for more information.

1260-38T User Manual
Racal Instruments © 1998 Module Operation 3-5
CLOSE Command The CLOSE command is used to close a channel.
Example:
CL[OSE] 1.0012
This CLOSE command will close channel 2 of multiplexer 01 on
the module at switch card module address 1.
OPEN Command The OPEN command is used to open a channel.
Example:
OP[EN] 3.0107
This OPEN command will open channel 7 of multiplexer 10 on the
module at switch card module address 3.
Note that channels remain closed until opened by an OPEN
command, RESET command, VXI hard or soft reset, or power-off.
PDATAOUT
Command
The PDATAOUT command causes the specified module to
transmit the CLOSED state of the relays within the switch module
to the 1260 Controller. The syntax used is:
PD[ATAOUT] <module address> [;<module address>] [;<module address>]
The responses to the PDATAOUT command is as follows:
1260-38T Two-wire
<module address>. 1260-38A 1x128 2-WIRE SCANNER/MULTIPLEXER
<module address> . <channel range>[,<channel range>] [,<channel range>]
<module address>.END
1260-38T Four-Wire
<module address>. 1260-38B 1x64 4-WIRE SCANNER/MULTIPLEXER
<module address> . <channel range>[,<channel range>] [,<channel range>]
<module address>.END
The response to the PDATAOUT command consists of a header
on the first line as with the PSETUP response. The next line
details the channels currently closed on the module and is blank
when no channels are closed. Again, the last line is denoted by the
11END'1 string of characters.

1260-38T User Manual
Module Operation 3-6 Racal Instruments © 1998
PSETUP Command The PSETUP command causes the specified module setup to be
transmitted to the VXI Controller. The syntax used is:
PS[ETUP] <module address>[ ;<module address>] [;<module address>]
Where:
<module address> is the switch card address.
The responses to the PSETUP command for the 1260-38T
Multiplexer/Scanner is as follows:
1260-38T Two-wire
<module address>. 1260-38A 1x128 2-WIRE SCANNER/MULTIPLEXER
<module address> . BBM
<module address>.END
1260-38T Four-Wire
<module address>. 1260-38B 1x64 4-WIRE SCANNER/MULTIPLEXER
<module address>. BBM
<module address>.END
The response to the PSETUP command consists of a header on
the first line. The header describes the model number following an
A or B designating two or four-wire, respectively. The next line
designates the setup mode for scanning which, by default, is
Break-Before-Make (BBM). The last line containing the "END"
characters denotes no more information to report.