Digital I/o

Can you 'measure' a 1 kHz, 3VDC square on a digital port of a PXI6723?  I try to make sure that the connection is good so I'm sending you the (sq) waveform analog on through a differential driver/receiver circuit and back into the DIO.  I test the signal to active / deactivate my FREQ.  Hi > OL > salvation > OL > salvation > lo... etc...

This maybe a diff but post...

My differential driver output is high impedance when its judgment and from what I understand when the 6723 sees a high impedance there is a pull up to ~ 3 volts so he tells a Summit if I looked at the port/channel.  So my question is how can I tell when the diff circuit signal is low?

MarcoMauri wrote:

crossrulz wrote:

You cannot capture a waveform with the OID.  However, you could measure the freqeuncy with a counter on the same card.

Hi crossrulz,

a digital waveform capture should be possible (as shown in the example provided with Labview Cont read dig Chan-Int Clk.vi).

Am I wrong?

Kind regards

Marco

If you read the specifications of the PXI-6723, the OID are only timed software.  Therefore, the values are read only when the software shows the map to enter the current value.  The calendar will be not deterministic (which I think is unimportant).  If you have hardware timed DIO, then a digital waveform could be captured.

Tags: NI Software

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