Confused about NI PXI 2575

Hello

I have a module SH200LFH-4xDB50F-S cable and NI PXI-2575.

Switch Soft Front Panel, under the schematic tab and 1 wire 196 x 1 topology, when I log in, say, channel 189 and COM and check the electrical contact between terminals 22 and 23 of the 50 pin-connector P4 SUB D, I get the contact. Fine.

But when I choose the topology of 95 x 1 2-wire, I think that if I close the relay k0 e.g., she closed the circuit between CH0 and CH95, both between pins 1 and 2 of the 50 connector pin. But this does not happen.

EDIT: Another way I thought that it worked if I for example close the k94 relay, I would contact between the positive cable of k94 and COM + (and k94 - with COM-) but that doesn't seem to be the case either.

Am I wrong?

Thank you

LFH200 Cable Installation Instructions: http://www.ni.com/pdf/manuals/373848f.pdf

NEITHER SMU/PXI-2575 Specifications: http://www.ni.com/pdf/manuals/373870n.pdf

Baobob,

I think you can close the wrong relay. Channel 94 is actually closed by driving relay k41. I would check the hardware diagram 2575 in aid of switches of OR for complete information on the person who closes the channel. I think it would be much easier to use the channel API to open / close the channels as the documentation of cable described the 'string' not the relay.

FYI, the reason for which the relay and the channel are different is that exchange channels depend on the topology and the relays are static for the whole device regardless of topology.

Tags: NI Products

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