What I believe you want to do is a retriggerable pulse train
generation (this is assuming the pulse is a consistent frequency/duty
cycle when on). There is a DAQmx example called multi-function Ctr
Retrigg Pulse Train Generation for AI Sample clock which should give
you a good starting point (ignore the AI part of it). You will have
to figure out some kind of trigger to restart the sequence. One easy
thing to do would be to set a digital line high and use that as your
trigger to start the pulse output.
