Racal Instruments 1260-X121 User manual

1260 VXI SWITCHING CARD
20 CHANNEL PLUG-IN
MODEL 1260-X121
PUBLICATION NO. 980914-X121
RACAL INSTRUMENTS
United States
(Corporate Headquarters and Service Center)
4 Goodyear Street, Irvine, CA 92618
Tel: [phone]; Fax: [phone]
5730 Northwest Parkway Suite 700, San Antonio, TX 78249
Tel: [phone]; Fax: [phone]
Europe
(European Headquarters and Service Center)
18 Avenue Dutartre, 78150 LeChesnay, France
Tel: [phone]; Fax: [phone]
29-31 Cobham Road, Wimborne, Dorset BH21 7PF, United Kingdom
Tel: [phone]; Fax: [phone]
Via Milazzo 25, 20092 Cinisello B, Milan, Italy
Tel: [phone]; Fax: [phone]
Racal Instruments Group Limited, Technologie Park, D-51429 Bergisch Gladbach, Germany
Tel: [phone]; Fax: [phone]
[email protected]
[email protected]
[email protected]
http://www.racalinstruments.com
[email protected]
www.racalinstruments.de
PUBLICATION DATE: October 21, 2005
Copyright 2005 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
our web site to verify and/or download the latest driver versions. The web address for driver downloads is:
http://www.racalinstruments.com/downloads
If you have any questions about software driver downloads or our privacy policy, please contact us at
[email protected]
WARRANTY STATEMENT
All Racal Instruments, Inc. products are designed and manufactured to exacting standards and in full
conformance to Racal’s ISO 9001:2000 processes.
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:
E-Mail: [email protected]
Telephone: [phone] (USA)
[phone] (UK)
Fax: [phone] (USA)
[phone] (UK)

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
unsure where to call, contact Racal Instruments, Inc. Customer Support Department in Irvine, California, USA
at 1-800-722-3262 or 1-949-859-8999 or via fax at 1-949-859-7139. We can be reached at:
[email protected].
PROPRIETARY NOTICE
This document and the technical data herein disclosed, are proprietary to Racal Instruments, and shall not,
without express written permission of Racal Instruments, be used, in whole or in part to solicit quotations from
a competitive source or used for manufacture by anyone other than Racal Instruments. The information
herein has been developed at private expense, and may only be used for operation and maintenance
reference purposes or for purposes of engineering evaluation and incorporation into technical specifications
and other documents which specify procurement of products from Racal Instruments.
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
by Seller. Racal Instruments products are not specifically designed, manufactured or intended to be used as
parts, assemblies or components in planning, construction, maintenance or operation of a nuclear facility, or
in life support or safety critical applications in which the failure of the Racal Instruments product could create
a situation where personal injury or death could occur. Should Buyer purchase Racal Instruments product for
such unintended application, Buyer shall indemnify and hold Racal Instruments, its officers, employees,
subsidiaries, affiliates and distributors harmless against all claims arising out of a claim for personal injury or
death associated with such unintended use.

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.

1260-X121 User Manual
i
Table of Contents
Chapter 1.............................................................................................................................. 1-1
SPECIFICATIONS.......................................................................................................................... 1-1
Introduction...................................................................................................................................1-1
Specifications...............................................................................................................................1-2
Power Dissipation.........................................................................................................................1-3
About MTBF.................................................................................................................................1-4
Ordering Information ....................................................................................................................1-5
Chapter 2.............................................................................................................................. 2-1
INSTALLATION INSTRUCTIONS................................................................................................... 2-1
Unpacking and Inspection............................................................................................................2-1
Reshipment Instructions...............................................................................................................2-1
Installation....................................................................................................................................2-1
Module Configuration...................................................................................................................2-2
Front Panel Connectors............................................................................................................2-3
Mating Connectors....................................................................................................................2-6
More About Maximum Current Ratings.....................................................................................2-7
Installation....................................................................................................................................2-8

1260-X121 User Manual
ii
Chapter 3...............................................................................................................................3-1
MODULE OPERATION ...................................................................................................................3-1
Operating Modes..........................................................................................................................3-1
Operating In Message-Based Mode.............................................................................................3-1
Channel Descriptors For The 1260-121 ...................................................................................3-1
Reply To The MOD:LIST? Command..........................................................................................3-2
Operating in Register-Based Mode..............................................................................................3-3
Chapter 4...............................................................................................................................4-1
PRODUCT SUPPORT.....................................................................................................................4-1
Product Support ...........................................................................................................................4-1
Reshipment Instructions...............................................................................................................4-1
Support Offices ............................................................................................................................4-2
Repair and Calibration Request Form..........................................................................................4-3

1260-X121 User Manual
iii
List of Figures
Figure 1-1, The 1260-X121..............................................................................................................1-1
Figure 2-1, 1260-X121 Block Diagram.............................................................................................2-2
Figure 2-2, Front Panel Connector Pin Numbering..........................................................................2-3
List of Tables
Table 2-1, 1260-X121 Front-Panel Connections .............................................................................2-4
Table 2-2, Mating Connectors and Pins...........................................................................................2-6
Table 3-1, Register Offset Addresses of the 1260-X121 Module ....................................................3-4
Table 3-2, ID Register Functionality of the 1260-X121 Module.......................................................3-4
Table 3-3, Register0 Functionality of the 1260-X121 Module..........................................................3-5
Table 3-4, Register1 Functionality of the 1260-X121 Module..........................................................3-5
Table 3-5, Register2 Functionality of the 1260-X121 Module..........................................................3-5
Table 3-6, Register3 Functionality of the 1260-X121 Module..........................................................3-6
Table 3-7, EPROM Descriptor Functionality of the 1260-X121 Module...........................................3-6

1260-X121 User Manual
iv
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1260-X121 User Manual
Racal Instruments ©2005 Specifications 1-1
Chapter 1
SPECIFICATIONS
Introduction The 1260-X121 is a plug-in switch module developed for the Racal
Instruments 1260-100X Adapt-a-Switch Carrier. The 1260-X121
includes the following features:
•Standard Adapt-a-Switch plug-in design, providing for ease of
replacement
•Data-Driven embedded descriptor, allowing immediate use with
any Option-01T switch controller, regardless of firmware
revision level.
Figure 1-1, The 1260-X121

1260-X121 User Manual
Specifications 1-2 Racal Instruments ©2005
The 1260-X121 is a 20-channel single-wire switch consisting of 20
individual SPST relay switches and 10 1X2 switches by software
configuration. The 1260-X121 plug-in fits into a 1260-100X Adapt-
a-Switch Carrier.
Specifications Bandwidth (-3dB) >300KHz
Insertion Loss
300 KHz < 2dB
Isolation
DC to 100 KHz > 60dB
100 to 300 KHz > 50dB
Crosstalk
DC to 100 KHz < -60dB
100 to 300 KHz < -50dB
Switching Voltage
AC 440V, Max
DC 230V, Max
Switching Current
AC 10A, Max.
DC 10A, Max
Switching Power
AC 2500VA, Max
DC 300W, Max
Path resistance < 100mΩ
Capacitance
Channel-Chassis < 20pF
Open-Channel < 20pF
Insulation resistance > 109Ω
Impulse Withstand Voltage >1,000V
Relay Settling Time < 15ms
Maximum Power Dissipation
60W
Cooling (25% Relays energized operating at full rated current)
4.27 Liters/sec @ 0.39 mmH2O

1260-X121 User Manual
Racal Instruments ©2005 Specifications 1-3
Shock 30g, 11ms, ½ sine wave
Vibration 0.013in. P-P, 5-55Hz
Bench Handling 4 in., 45°
Temperature
Operating 0°C to +60°C
Non-operating -40°C to +70°C
Relative Humidity 85% Max., non-condensing at
< 30°C
Altitude
Operating 15,000 feet
Non-operating 15,000 feet
Power Requirements
+5VDC 300mA Max.
+5VDC 40mA per energized relay.
Weight 15.71oz. (0.445kg)
MTBF (MIL-HDBK-217-FN2 method)
Including relays 783,549 hours at 25°C
718,344 hours at 30°C
Safety Standard EN61010-1
Pollution Degree 2
Power
Dissipation While the cooling of the Adapt-a-Switch carrier is dependent upon
the chassis into which it is installed, the carrier can normally
dissipate approximately 160 W. The maximum power dissipation
for an individual module is 60W. Care must be taken, then, in the
selection and loading of the plug-in modules used in the carrier. It
is not possible to fully load the carrier, energize every relay, and
run full power through every set of contacts, all at the same time.
In practice this situation would never occur.
To properly evaluate the power dissipation of the plug-in modules,
examine the path resistance, the current passing through the relay
contacts, the ambient temperature, and the number of relays
closed at any one time.
For example, if a 1260-X121 module (containing 20 relays) has 5
relays closed, passing a current of 10 A, then:
Total power dissipation =
[(current)2* (path resistance) * 5 ] + (quiescent power)

1260-X121 User Manual
Specifications 1-4 Racal Instruments ©2005
By substituting the actual values:
Total power dissipation =
[(10 A)2* (0.1 Ω) * 5] + ( 1.5 W) = 51.5 W at 55°C
This is acceptable power dissipation for an individual plug-in
module. In practice, rarely are more than 25% of the module’s
relays energized simultaneously, and rarely is full rated current run
through every path. In addition, the actual contact resistance is
typically one-half to one-fourth the specified maximum, and
temperatures are normally not at the rated maximum. The power
dissipated by each plug-in should be no more than 15 W if all six
slots are used simultaneously. This yields the following guideline:
3 A Max. 15 relays closed
5 A Max. 6 relays closed
10 A Max. 2 relays closed
The numbers in the above table represent worst-case, elevated-
temperature, end-of-life conditions.
Additionally, if fewer plug-in modules are used, more power may
be dissipated by the remaining cards. By using a chassis with high
cooling capacity, such as the Racal Instruments 1261B, almost any
configuration may be realized.
About MTBF The 1260-X121 MTBF is 783,549 hours at 25°C and 718,344
hours at 30°C, calculated in accordance with MIL-HDBK-217E,
with the electromechanical relays set at 50% rated load at 85°C.
Factors affecting relay life expectancy are:
1. Switched voltage
2. Switched current
3. Switched power
4. Maximum switching capacity
5. Maximum rated carrying current
6. Load type (resistive, inductive, capacitive)
7. Switching repetition rate
8. Ambient temperature
The most important factor is the maximum switching capacity,

1260-X121 User Manual
Racal Instruments ©2005 Specifications 1-5
which is an interrelationship of maximum switching power,
maximum switching voltage and maximum switching current.
When a relay operates at a lower percentage of its maximum
switching capacity, its life expectancy is longer. The maximum
switching capacity specification is based on a resistive load, and
must be further de-rated for inductive and capacitive loads.
The relay used on the 1260-X121 plug-in is Racal part no. 310344.
The relay manufacturer’s specifications for this relay are:
Life Expectancy
Mechanical 10,000,000 operations
Electrical 100,000 operations at full rated load
For additional relay specifications, refer to the relay manufacturer’s
data sheet.
Ordering
Information Listed below are part numbers for 1260-X121 switch module and
available mating connector accessories. Each 1260-X121 uses two
mating connectors.
ITEM DESCRIPTION PART #
1260-X121 Switch
Module 1260-X121
Consists of:
PCB Assembly
Manual for 1260-X121
408008
405247
980914-
X121
20 Pin Mating Connector 20 Pin Conn. Kit w/backshell & solder cup
pins 407660
Additional Manual Manual for 1260-X121 980914-
X121

1260-X121 User Manual
Specifications 1-6 Racal Instruments ©2005
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1260-X121 User Manual
Racal Instruments ©2005 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 and reported.
2. Remove the instrument from its carton, preserving the factory
packaging as much as possible.
3. Inspect the switching module for any defects 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 material when returning the switching
module to Racal Instruments for 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.
Installation Installation of the 1260-X121 Switching Module into a 1260-100X
Carrier assembly is described in the Installation section of the
1260-100X Adapt-a-Switch Carrier Manual.

1260-X121 User Manual
Installation Instructions 2-2 Racal Instruments ©2005
Module
Configuration The 1260-X121 is a 20-channel single-wire switch module
consisting of twenty SPST relay switches ten SPST configuration
relays. This architecture permits the 1260-X121 module to be
organized via software as twenty SPST or ten 1X2 switches.
For a block diagram of the 1260-X121, see Figure 2-1.
FRONT
PANEL
2X Burndy
MS20PM-58
CONTROL
CIRCUITS
AND RELAY
DRIVERS
CH00
CH01
CH02
CH19
VRR
Figure 2-1, 1260-X121 Block Diagram

1260-X121 User Manual
Racal Instruments ©2005 Installation Instructions 2-3
Front Panel
Connectors
The 1260-X121 has two 20-pin front-panel connectors, labeled
J200 and J201. It has one pin for each input and one for each
output. See Figure 2-2 for pin numbering. Table 2-1 shows the
mapping of channel numbers to connector pins. Information about
available mating connectors is provided immediately after
Table 2-1.
Figure 2-2, Front Panel Connector Pin Numbering

1260-X121 User Manual
Installation Instructions 2-4 Racal Instruments ©2005
Table 2-1, 1260-X121 Front-Panel Connections
IN OUT
CH00 J200-C J200-F
CH01 J200-B J200-E
CH02 J200-A J200-D
CH03 J200-K J200-N
CH04 J200-J J200-M
CH05 J200-H J200-L
CH06 J200-S J200-V
CH07 J200-R J200-U
CH08 J200-P J200-T
CH09 J200-X J200-W
CH10 J201-C J201-F
CH11 J201-B J201-E
CH12 J201-A J201-D
CH13 J201-K J201-N
CH14 J201-J J201-M
CH15 J201-H J201-L
CH16 J201-S J201-V
CH17 J201-R J201-U
CH18 J201-P J201-T
CH19 J201-X J201-W
1260-X121 as (1x1)’s

1260-X121 User Manual
Racal Instruments ©2005 Installation Instructions 2-5
IN OUT
CH00 J200-C J200-F
(J200-B) J200-E
CH02 J200-A J200-D
(J200-K) J200-N
CH04 J200-J J200-M
(J200-H) J200-L
CH06 J200-S J200-V
(J200-R) J200-U
CH08 J200-P J200-T
(J200-X) J200-W
CH10 J201-C J201-F
(J201-B) J201-E
CH12 J201-A J201-D
(J201-K) J201-N
CH14 J201-J J201-M
(J201-H) J201-L
CH16 J201-S J201-V
(J201-R) J201-U
CH18 J201-P J201-T
(J201-X) J201-W
1260-X121 as (1x2)’s
Note
Pins shown in parentheses are for reference only.

1260-X121 User Manual
Installation Instructions 2-6 Racal Instruments ©2005
Mating
Connectors
Mating connector accessories are available for the 1260-X121:
20 Pin Connector Kit with backshell and pins
P/N 407660
The 20-pin connector kit consists of a connector housing,
aluminum backshell, and twenty solder-cup pins. The pins are also
available from Positronic in crimp versions and for smaller wire
diameters.
The mating connector pins are solder type. The corresponding
removal tool is Racal P/N 9081.
After wire attachment, the pin is inserted in the housing and will
snap into place, providing positive retention. To ensure that the pin
is locked into place, the assembler should pull on the wire after
insertion.
Table 2-2, Mating Connectors and Pins
Racal P/N Manufacturer Mfr. P/N Description
602349-120 Positronic GMCT20F0E100J0
Insulator block (diallyl pthalate),
20-position. Mates with front-
panel connector. Pins sold
separately.
601850-900 Positronic FC114N2 Female contact, crimp type, for
14 AWG wire. Mates with front-
panel connector pins.
None Positronic FC116N2 Female contact, crimp type,
for 16 AWG wire. Mates with
front-panel connector pins.
None Positronic FS114N2 Female contact, solder type, for
14 AWG wire. Mates with front-
panel connector pins.
None Positronic FS116N2 Female contact, solder type, for
16 AWG wire. Mates with front-
panel connector pins.