wait and trigger the first incoming digital dashboard

Maybe it's a frequently asked question, but I managed to understand the trigger DAQmx VI. Is the trigger VI supposed to block the program until Gets an edge? It waits indefinitely?

A screenshot of my failed attempt is attached to this message. I want to start my measurement (HAVE several channels) to the first incoming digital edge (or increment of the counter) on a system time real PXI. Before entering the loop of measure I want to wait for an edge (possibly indefinitely). Inside this loop, I want to begin to acquire the data values and counter of I.

I even tried to use the example, but I get an error of dialog (see screenshot).

Hello pgraebel,

The trigger VI just configures the behavior of the acquisition.  So, once the start VI task is called, the task itself will be armed and waiting for the trigger.  You trigger attempt.jpg, what will happen is that the task is configured and started.  When starting, running VI will proceed to the loop where you call the read I.  The map will wait for relaxation, with no sample being acquired until the material sees the trigger.  If the trigger is never sent, the loop will iterate that you have not the VI wait indefinitely, but only for 10 seconds.  Thus, if no data is received, the loop will iterate every 10 seconds. If you want to read to wait indefinitely, the value of the timeout on DAQmx Read.vi-1.

All that being said, it is not quite clear what is the problem with your attempt to trigger - everything looks good to me; are you an error?  Or the just VI hang up (which could be due to the fact that the relaxation is never received)?

Let me know if it helps.

Cheers, Matt

Tags: NI Software

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