Strange behavior. 2590 relay switch and Get position vi.

I'm reading a PXI2590 1 x 4 MUX switch relays that I fires only when necessary. I know the names of the relays are MUX01, MUX23 and MUX0123. If I switch, niConnect channels INIT, wait Debounce and can get the Position of the relay, I get a correct reading (closed or open). I then called niSwitch close .vi and the switch remains in this position.

However if I just called INIT, niSwitch getting the Position of relay and close vi seems the selector to a different value (default?). I confirmed this behavior using a HF generator and Analyzer of spec.

Is what I do with these evil vi? Can I use DAQmx driver for this switch instead?

LabVIEW 8.5.1

OR-Switch 3.70.49152

NOR-DAQmx 8.7.1f2

NOR-PXI-2590

Hello GovBob,

Correct me if I'm wrong.  First you call OR-SWITCH boot (not initialize with topology) or initialize options with the 'reset device' Boolean is unwired? (which means reset = true)

Then, in a case: call OR-SWITCH connect channels, wait OR-SWITCH Debounce, OR-SWITCH get relay post, then NOR-SWITCH close (close a session, not close relay).  Then physically measure opens or shorts.

In the other case: appeal OR-SWITCH get relay post, then NOR-SWITCH close.  Then physically measure opens or shorts.

The results are the second case has openings (ch0 is connected to the com).  This is expected behavior since the indicator 'reset the device' in one of the screws initialize is TRUE if left thread continues.  However, if you physically measure different values compared to what OR-SWITCH get post is back, so please submit your screws and a list of the steps and the values measured for each stage.  I hope this helps!

-Jordan

Tags: NI Products

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