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Programming the Multiplexer
Addressing the
Multiplexer
Card Numbers
Chapter 1
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To program the E1476A multiplexer using Standard Commands for
Programmable Instruments (SCPI), you must select the interface address
and SCPI commands used. This section gives guidelines to program the
multiplexer, including:
•
Addressing the Multiplexer
•
Default Conditions
•
Start-Up Exercises
To program the E1476A multiplexer using SCPI, you must select the
computer language, interface address, and SCPI commands to be used.
Guidelines to select SCPI commands for the multiplexer follow.
NOTE
This discussion applies only to SCPI programming. See Appendix B for
information on register-based programming of multiplexer registers.
To address specific channels within a multiplexer, you must specify the
SCPI command and multiplexer channel address. For the multiplexer, use
&/26H FKDQQHOBOLVW! to close the channels specified. Use 23(1
FKDQQHOBOLVW! to open the channels specified. Use 6&$1 FKDQQHOBOLVW!
to close and open the set of channels specified, one channel at a time.
The multiplexer card number depends on the switchbox configuration
(single-module or multiple-module) set for the multiplexers. Leading
zeroes can be ignored for the card number. See "Setting the Logical
Address Switch" in this chapter for more information on setting logical
addresses and switchbox configurations.
For a
single-module switchbox
multiple-module switchbox
with the lowest logical address is card number 01, the module with the next
lowest logical address is card number 02, etc.
For example, assume three multiplexers are configured to form a
multiple-module switchbox instrument with logical addresses of 112, 113,
and 114 as shown in Figure 1-19. Since card number 01 is assigned to the
module with the lowest logical address, card number 01 is assigned to the
card at logical address 112. Card number 02 is assigned to the card at
address 113 and card number 03 is assigned to the card at address 114.
, the card number is always 01. For a
, the card numbers are 01, 02,...,nn. The module
Getting Started 31
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