Output 5V digital while gaining some HAVE

Hello fans of LV,.

I am confronted with (what I thought would be) a trivial task:

I'm certain analog signals on a 6351 OR USB using DAQmx.  And I want to trigger an external device simultaneously.  So I want to start my task of AI, a digital to go HIGH output pin.  And when it stops, I want the PIN to go DOWNSTAIRS.

I think actually that NEITHER provided an '' integrated '' signal for this... something I could easily move to one of the PFI PIN.  As a "HAVE busy signal."  But it does not appear that this exists.

So instead, I thought I could do a task "HAVE simultaneous and DO."  It works well, except that the PIN HIGH when rest end tasks.

Any ideas on how I can fix this?

josborne wrote:

Hmmm.  I don't think that the sample clock won't work because it is a pulse train.  It goes UP and DOWN for each point of the data acquired.  Actually, I want the signal stay high during the acquisition of all.

I think you're right about using a PIN.  But I am confused how to implement in LabVIEW.

I think I misunderstood what you mean by an acquisition, then.  I thought you meant just a single point.  Are say you that you will acquire a fixed number of samples and you need relaxation to remain high until there finishes the entire points series?

As I said, I'm not an expert in routing of the signal, so there is probably a more efficient way to do this, but the simplest, you could take a signal from a digital output pin and split with one end going to the external device and the other end to the input trigger to HAVE it (probably that in software, but I don't know if you can split the signal in this case).  Configure separate tasks and the AI, no need to synchronize them.  When you start to DO it, the AI will trigger.  Then you just need to somehow disable DO when HAVE complete - but went too urgent?  If you do not need a precise timing for this purpose then just wait for the AI to finish, then turns off the DO.

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