background image

1260-21 User Manual 

Installation Instructions 2-8  

 

Racal Instruments 

©

 2005 

 

More About 
Maximum Current 
Ratings 

The front panel connector and pins are rated for 10 A per pin, 
with all channels conducting full-rated current. The relays are 
rated at 10 A. This keeps the temperature rise within 10

°

C. It 

should be noted that with all electromechanical relays, the higher 
the switched power (voltage times current), the shorter the useful 
life of the relays. 

Definitions: 

 

Max current carrying capacity

 

The maximum current that the relay can conduct if the relay is 
not switched while voltage is applied. The maximum current 
carrying capacity is affected by the size of the conducting 
section of the contact at its smallest area. The listed values are 
obtained from several tests in laboratories under room-
temperature conditions (21

°

C). The contact is considered to be 

in free air. The maximum current carrying for the 1260-21 is 
10 A. 

 

Max

 o

perating current

 

The current the contacts can switch while conducting, without 
deteriorating. This depends on working conditions, such as 
dissipated heat, cooling provisions, ambient temperature, 
insulation material, etc. The maximum operating current for the 
1260-21 is 10 A. 

 

Recommended continuous current

 

The maximum current recommended for indefinitely-long time 
periods. The primary concern here is the heat generated in the 
relay. This specification can be applied for normal working 
conditions. The specification includes a safety margin. However, 
there are restrictions in the application of the given values. The 
most important restriction is the cross-sectional area of the 
connecting wire, insulation temperature range, and wire bundling. 
The recommended continuous current for the 1260-21 is 10 A. 

 

Installation 

To install the 1260-21 Switching Module into a VXI mainframe 
chassis, engage the printed circuit board into the grooves of the 
desired chassis slot. Slide the 1260-21 into the chassis until its 
connector mates with the connector on the chassis backplane. 
Push firmly to fully seat the connector. Tighten the two retaining 
screws at the top and bottom of the 1260-21 module. 

 

Summary of Contents for 1260 VXI

Page 1: ...m Road Wimborne Dorset BH21 7PF United Kingdom Tel 44 0 1202 872800 Fax 44 0 1202 870810 Via Milazzo 25 20092 Cinisello B Milan Italy Tel 39 0 2 6123 901 Fax 39 0 2 6129 3606 Racal Instruments Group L...

Page 2: ...ent 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 r...

Page 3: ...ce 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...

Page 4: ...sion 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...

Page 5: ...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 Mod...

Page 6: ...n 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...

Page 7: ...igure 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...

Page 8: ...1260 21 User Manual iv This page was left intentionally blank...

Page 9: ...ssage 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 descript...

Page 10: ...1260 21 User Manual Specifications 1 2 Racal Instruments 2005 Figure 1 1 The 1260 21...

Page 11: ...itching Current AC 10 A Max DC 10 A Max Switching Power AC 1150 VA Max DC 280 W Max Path resistance 20 m 9 A 100 m 1 mA Capacitance Channel Chassis 40 pF Open Channel 40 pF Insulation resistance 109 R...

Page 12: ...wer 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 selectio...

Page 13: ...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 Addit...

Page 14: ...or 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 operation...

Page 15: ...nt 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 servici...

Page 16: ...ting 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 modul...

Page 17: ...1260 21 User Manual Racal Instruments 2005 Installation Instructions 2 3 Figure 2 1 1260 21 Switch Block Diagram...

Page 18: ...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 channe...

Page 19: ...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...

Page 20: ...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 CO...

Page 21: ...on To ensure that the pin is locked into place the assembler should pull on the wire after insertion Refer to Table 2 1 for channel to pin mapping information Table 2 2 contains manufacture s part num...

Page 22: ...the contacts can switch while conducting without deteriorating This depends on working conditions such as dissipated heat cooling provisions ambient temperature insulation material etc The maximum op...

Page 23: ...l registers of the 1260 21 module A conceptual view of the message based mode of operation is shown in Figure 3 1 below Figure 3 1 Message Based Mode of Operation In the register based mode the user w...

Page 24: ...e message based mode allows the user to send ASCII text commands to the 1260 01T and to read replies from the 1260 01T In addition some features such as the SCAN list are available only in the message...

Page 25: ...is the address of the 1260 21 module as set by the logical address DIP switch SW1 on the 1260 21 The module address is a number from 1 through 12 inclusive Set the module addresses for the 1260 21 an...

Page 26: ...21 12 CHANNEL SPDT 10A SWITCH Operating The 1260 21 in Register Based Mode In register based mode the 1260 21 is operated by directly writing to control registers and reading from status registers on...

Page 27: ...placed into the Offset Register of the 1260 01T by the Resource Manager 2 The module address of the 1260 21 module This is a value in the range 1 through 12 3 Each control register status register on...

Page 28: ...rol Register 0 205803 Control Register 1 Refer to Figure 3 3 for 1x2 channel nomenclature when determining channel assignments Table 3 1 shows the channel assignments for each control register while T...

Page 29: ...e 2XX Y Where 2 1x2 Mux XX Switch Y Relay Node C for COM 2XX C 2XX 0 2XX 1 Relay Nomenclature for Command Writes 2XXRY Where 2 1x2 Mux XX Switch R Relay Y Relay within Switch Relay Nomenclature for St...

Page 30: ...201R0 Switch 0 Relay 0 200R0 1 X X X X Switch 11 Relay 0 211R0 Switch 10 Relay 0 210R0 Switch 9 Relay 0 209R0 Switch 8 Relay 0 208R0 Table 3 2 Status Register Channel Assignments Channels Control Regi...

Page 31: ...1 0 xxxx1xxx 0 xxxx0xxx 3 3 4 4 204 C 204 0 0 xxx0xxxx 0 xxx1xxxx 3 3 4 4 204 C 204 1 0 xxx1xxxx 0 xxx0xxxx 3 3 5 5 205 C 205 0 0 xx0xxxxx 0 xx1xxxxx 3 3 5 5 205 C 205 1 0 xx1xxxxx 0 xx0xxxxx 3 3 6 6...

Page 32: ...1260 21 User Manual Module Operation 3 10 Racal Instruments 2005 This page was left intentionally blank...

Page 33: ...Parts Department When sending your instrument in for repair complete the form in the back of this manual For worldwide support and the office closes to your facility refer to the Support Offices sect...

Page 34: ...78249 Tel 210 699 6799 Fax 210 699 8857 Europe European Headquarters and Service Center 18 Avenue Dutartre 78150 LeChesnay France Tel 33 0 1 39 23 22 22 Fax 33 0 1 39 23 22 25 29 31 Cobham Road Wimbor...

Page 35: ...Postal Code Country Technical Contact Phone Number Purchasing Contact Phone Number 1 Describe in detail the problem and symptoms you are having Please include all set up details such as input output l...

Reviews: