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104 L4400 User’s Guide
4 L4421A 40-Channel Armature Multiplexer
Example: Querying channels for open or close state The following command
returns a 1 (true) or 0 (false) state of channel 036.
ROUTe:CLOSe (@1036)
ROUTe:CLOSe? (@1036) !Returns a 1
ROUTe:OPEN? (@1036) !Returns a 0
Example: Querying the Identity of the Instrument The following command
returns the identity of the L4421A:
SYSTem:CTYPe? 1
Querying and Clearing Cycle Count, and Resetting Modules
Example: Querying the cycle count for a relay The following command returns
the cycle count on channels 7 and 16.
DIAGnostic:RELay:CYCLes? (@1007,1016)
Example: Clearing the cycle count for a relay The following command resets
the cycle count to zero on the channels 7 and 16 for a MUX module in slot 1.
DIAGnostic:RELay:CYCLes:CLEar (@1007,1016)
Example: Resetting module(s) to power-on state The following command
resets the L4421A to its power-on state.
SYSTem:CPON 1
L4421A 40-Channel Armature Multiplexer Hardware Description
The L4421A 40- Channel Armature Multiplexer is divided into two banks with
20 latching armature switches (channels 1-20 and 21-40) in each. The
instrument also offers four additional fused relays (channels 41- 44) for
making AC and DC current measurements with no external shunts needed.
These current channels feature “make- before- break” connections to ensure
continuous current flow when switching from one current channel to
another. The current fuses are replaceable. Refer to the L4400 Service Guide
for specific information about these fuses.
This module also contains nine armature analog bus relays (channels
911- 914, 921- 924, and 931), four on each bank that can connect the bank
relays to the system analog buses and one that connects the current relays to