Racal Instruments 1260 VXI User manual

1260 VXI SWITCHING CARD
12 CHANNEL, 10A HIGH POWER
SWITCH MODULE
MODEL 1260-21
PUBLICATION NO. 980673-065
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)
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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: August 25, 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 auto-
transformer, 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.

1260-21 User Manual
i
Table of Contents
Chapter 1.......................................................................................................................1-1
SPECIFICATIONS...................................................................................................................1-1
Introduction............................................................................................................................1-1
Specifications........................................................................................................................1-3
Power Dissipation..................................................................................................................1-4
About MTBF ..........................................................................................................................1-5
Ordering Information .............................................................................................................1-6
Chapter 2.......................................................................................................................2-1
INSTALLATION INSTRUCTIONS ...........................................................................................2-1
Unpacking and Inspection.....................................................................................................2-1
Reshipment Instructions........................................................................................................2-1
Option 01T Installation ..........................................................................................................2-1
Module Installation ................................................................................................................2-2
Module Configuration ............................................................................................................2-2
Front Panel Connectors.....................................................................................................2-4
Mating Connectors.............................................................................................................2-7
More About Maximum Current Ratings .............................................................................2-8
Installation.............................................................................................................................2-8

1260-21 User Manual
ii
Chapter 3.......................................................................................................................3-1
MODULE OPERATION...........................................................................................................3-1
Operating Modes...................................................................................................................3-1
Operating In Message-Based Mode...................................................................................... 3-3
Channel Descriptors For The 1260-21..............................................................................3-3
Reply To The MOD:LIST? Command................................................................................3-4
Operating The 1260-21 in Register-Based Mode.................................................................. 3-4
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

1260-21 User Manual
iii
List of Figures
Figure 1-1, The 1260-21...........................................................................................................1-2
Figure 2-1, 1260-21, Switch Block Diagram .............................................................................2-3
Figure 2-2, Front Panel Connector Pin Numbering...................................................................2-5
Figure 3-1, Message-Based Mode of Operation.......................................................................3-1
Figure 3-2, Register-Based Mode of Operation........................................................................3-2
Figure 3-3, 1X2 Switch..............................................................................................................3-7
List of Tables
Table 2-1, 1260-21 Front-Panel Connections & Commands....................................................2-6
Table 2-2, Mating Connectors and Pins....................................................................................2-7
Table 3-1, Control Register Channel Assignments...................................................................3-8
Table 3-2, Status Register Channel Assignments....................................................................3-8
Table 3-3, Registers Values......................................................................................................3-9

1260-21 User Manual
iv
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1260-21 User Manual
Racal Instruments ©2005 Specifications 1-1
Chapter 1
SPECIFICATIONS
Introduction The 1260-21 is a High Power VXI Switch Module developed for the
Racal 1260 Series of switch modules.
The 1260-21 is available configured from the factory and can be
ordered with the Option-01T Message Based Interface.
The following features are included in the 1260-21
•Message Based Interface Option available.
•Supports coil voltage Read Back to test coils are driven.
•Data-Driven embedded descriptor, allowing immediate use
with any Option-01T switch controller, regardless of
firmware revision level.
The 1260-21 is a high power, single-wire switching module that
consists of twelve 1x2 switches. Each switch can handle current up
to 10 Amps. The 1260-21 plug-in fits into a standard VXI chassis.

1260-21 User Manual
Specifications 1-2 Racal Instruments ©2005
Figure 1-1, The 1260-21

1260-21 User Manual
Racal Instruments ©2005 Specifications 1-3
Specifications Bandwidth (-3dB) 300 KHz
Crosstalk Isolation
DC to 100 KHz > 60 dB
100 KHz to 300 KHz > 50 dB
Channel Crosstalk
DC to 100 KHz < -60 dB
100 KHz to 300 KHz < -50 dB
Switching Voltage
AC 130 V, Max
DC 32 V, Max
Switching Current
AC 10 A, Max
DC 10 A, Max
Switching Power
AC 1150 VA, Max
DC 280 W, Max
Path resistance < 20 mΩ@ 9 A
< 100 mΩ@ 1 mA
Capacitance
Channel-Chassis < 40 pF
Open-Channel < 40 pF
Insulation resistance > 109Ω
Relay Settling Time < 25 ms
Breakdown Voltage > 1000 V DC
Shock 30g, 11 ms, ½ sine wave
Vibration 0.013 in. P-P, 5-55 Hz
Bench Handling 4 in., 45°
Cooling See 1260-100 cooling data
Temperature
Operating 0°C to +55°C
Non-operating -40°C to +75°C
Relative Humidity 95%, non-condensing at < 30°C

1260-21 User Manual
Specifications 1-4 Racal Instruments ©2005
Altitude
Operating 10,000 feet
Non-operating 15,000 feet
Power Requirements (with Option-01T)
+5V 0.541 A dynamic current
1.805 A peak current
+12V 3.000 A dynamic current
3.000 A peak current
Cooling (25% Relays energized operating at full rated current)
1.69 Liters/sec @ 0.113 mmH2O
Weight
with Option-01T 3.0 lbs. (1.361 kg)
w/o Option-01T 3.0 lbs. (1.361 kg)
MTBF (MIL-HDBK-217-FN2 method)
Excluding relays 1,500,000 hours
Including relays 280,000 hours
Relay Life Expectancy
Mechanical 5,000,000 operations
Electrical 10,000 operations at full load
Dimensions (Module) C-Size, Single Slot VXI bus Module
Power
Dissipation While the cooling of the 1260-21 is dependent upon the chassis
into which it is installed, the carrier can normally dissipate
approximately 100 W. 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, power to the coils, the ambient temperature, and the
number of relays closed at any one time.
For example, if a 1260-21 module (containing 12 relays) has 3
relays closed, passing a current of 10 A, then:
Total power dissipation =
[(current)2* (path resistance) * 3 ] + (coil power * 3) +
(quiescent power)

1260-21 User Manual
Racal Instruments ©2005 Specifications 1-5
By substituting the actual values:
Total power dissipation =
[(10 A)2* (.020 Ω) * 3] + [(12 V)2/ 80 Ω* 3] + (9.0 W)
= 20.4 W at 55°C
This is acceptable power dissipation for an individual plug-in
module. The overall module power dissipation is approximately
20.4 W, which is well within the cooling available in any
commercial VXIbus chassis. 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 typical power dissipation for each module should
be no more than 10.2 W.
Most users of a signal-type switch, such as the 1260-21, switch no
more than a few hundred milliamperes and are able to energize all
relays simultaneously, should they so desire.
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 1260-21 MTBF is 1,500,000 hours, calculated in accordance
with MIL-HDBK-217-FN2, with the exception of the
electromechanical relays. Relays are excluded from this
calculation because relay life is strongly dependent upon operating
conditions. 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

1260-21 User Manual
Specifications 1-6 Racal Instruments ©2005
For example, under a given condition of 10 A switched current, 10
cycles/hour switch rate, and 30°C ambient temperature, MTBF is
calculated to be 280,000 hours.
The most important factor is the maximum switching capacity,
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.
For more details about the above life expectancy factors, refer to
the data sheet for the switch plug-in module.
The relay used on the 1260-21 plug-in is Racal part no. 310314-
001. The relay manufacturer’s specifications for this relay are:
Life Expectancy
Mechanical 5,000,000 operations
Electrical 10,000 operations at full rated load
(resistive)
For additional relay specifications, refer to the relay manufacturer’s
data sheet.
Ordering
Information Listed below are part numbers for the 1260-21 switch module. The
1260-21 uses a single type of mating connector.
ITEM DESCRIPTION PART #
1260-21 Switch Module
w/o – 01T 12 Channel, 10 A SPDT Power Switch Consists of:
405233 PCB Assy.
1260-21 manual
408004
405233
980673-065
Option-01T Option-01T (installed)
Option-01T (spare)
Instruction Manual for Option-01T
(Must be added w/ Option-01T installed)
OPT-405108-001
407531-001
980806-999
1260-21 Connector Mating Kit Consists of:
3 16-pin mating connector shells
54 female connector pins
407917
Additional Manual 980673-065

1260-21 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.
Option 01T
Installation Installation of the Option 01T is described in the Installation and
Setup section of the 1260A-Option 01T Users Manual, Publication
No. 980806-999.

1260-21 User Manual
Installation Instructions 2-2 Racal Instruments ©2005
Module
Installation Installation of the 1260-21 Switching Module into a VXI mainframe,
including the setting of switches SW1-1 through SW1-4, SW2, and
SW3, is described in the Setup Section of the 1260A Option 01T
Users Manual, Publication No. 980806-999.
Module
Configuration The 1260-21 is a 12-channel module consisting of 12 individual
DPDT relay switches. The relay architecture consists of 12 1x2
switches.
For a block diagram of the switches used on the 1260-21, refer to
Figure 2-1.

1260-21 User Manual
Racal Instruments ©2005 Installation Instructions 2-3
Figure 2-1, 1260-21, Switch Block Diagram

1260-21 User Manual
Installation Instructions 2-4 Racal Instruments ©2005
Front Panel
Connectors The 1260-21 has three 16-pin front-panel connectors, labeled
J200, J201 and J202. 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 in Table 2-2.

1260-21 User Manual
Racal Instruments ©2005 Installation Instructions 2-5
Figure 2-2, Front Panel Connector Pin Numbering
8
1
16
9
J200
J201
J202

1260-21 User Manual
Installation Instructions 2-6 Racal Instruments ©2005
Table 2-1, 1260-21 Front-Panel Connections & Commands
SW Function Connector SW Function Connector
0 COM 0 J200-9 1 COM 1 J200-1 C
CH0-1 J200-10 CH1-1 J200-2 NC
CH0-2 J200-11 CH1-2 J200-3 NO
2 COM 2 J200-12 3 COM 3 J200-4 C
CH2-1 J200-13 CH3-1 J200-5 NC
CH2-2 J200-14 CH3-2 J200-6 NO
4 COM 4 J201-9 5 COM 5 J201-1 C
CH4-1 J201-10 CH5-1 J201-2 NC
CH4-2 J201-11 CH5-2 J201-3 NO
6 COM 6 J201-12 7 COM 7 J201-4 C
CH6-1 J201-13 CH7-1 J201-5 NC
CH6-2 J201-14 CH7-2 J201-6 NO
8 COM 8 J202-9 9 COM 9 J202-1 C
CH8-1 J202-10 CH9-1 J202-2 NC
CH8-2 J202-11 CH9-2 J202-3 NO
10 COM 10 J202-12 11 COM 11 J202-4 C
CH10-1 J202-13 CH11-1 J202-5 NC
CH10-2 J202-14 CH11-2 J202-6 NO