Trigger help needed!!

[Peter]

Im currently creating a program to measure EMG signals, and need to
incorporate a trigger into my program and I have no idea how to do it
as im not that profitiant with Labview.

The trigger is a 5V 50ms analogue pulse and i need it to start the
program to acquire data and stop it after a number of trigger pulses
and then start acquisition again after another number of trigger
pulses and so on. The first data acquisition may not be with the first
trigger however, as my colleagues have not decided on the final
experiment parameters, so i need to be able to change which pulse the
program starts for the very first time!!

The program I have uses AI configeration/start and read subprograms if
this is any help and have used film frames sequences in it to
o.

I apologise if this is a little unclear, as I said im not too good
with Labview. If anyone thinks they can help but need more info please
just email me!!!!

Many thanks!

Peter

[JRA]

You might want to start with the shipping examples which ship with LabVIEW. There is one titled Acquire N Scans Analog Harware Trig.vi which sounds like what you are looking for. That will at least show you how it's done there. Also, I didn't see any info about your particular DAQ card, so you will want to make sure this is supported by the hardware. Otherwise, you could use software triggering. In addition, I bet that if you post this to the Data Acquisition exchange, you may get more help from those guys. Good luck!