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How to digitally trigger D/A conversion

A hopefully simple LABVIEW (5.1) DAQ question from a newbie:
I need to digitally trigger a single channel D/A conversion of a
different signal every 50 milliseconds (signal length < 4096 samples,
using PCI 6111E board in a 400 Mhz Pentium).

I create and store the different signals in a 2-D array and use Finite
Pulse Train.vi as a first attempt at a trigger signal.

The available example VIs and documentation don't make it clear how to
loop through and repeatedly trigger timed D/A conversion. Are there any
examples out there or documentation of how to do this? Any help would
be greatly appreciated!!
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