Multiple Channels with Single Digital Edge Trigger

I have a simple vi where two analog channels are read in and recorded simultaneously to a lvm file and plotted on a waveform graph. I need a digital edge to post trigger the data acquisition for both channels.
I can get this vi to work with one analog channel and the digital edge trigger just fine.
When I remove the digital edge trigger, I can get the vi to work with both analog channels. Both signals plot on a waveform graph, and record nicely in the lvm file.
The issue is how I am setting up the digital trigger (see attached). The program is never entering the while loop. Where am I going wrong?
Chassis:cDAQ-9172
Analog Card:NI 9205 (Trigger Source PFI0)
LabView: 8.6
OS: Windows XP
Solved!
Go to Solution.
Attachments:
Analog Input with Digital Edge Trigger.vi ‏52 KB

Gardma,
I am going to take a quick guess (I'm lazy and haven't actually tested the code ), but, since it works without the trigger and given that you have it so that the read never times out (i.e. = -1), there is something going on such that the trigger is never generated on the source pin. Just a thought.
Cheers, Matt
Matt Richardson
Certified LabVIEW Developer
MSR Consulting, LLC

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