TTL Pulse with USB-6221, trigger for FES stimulation

Hi All

Im trying to activitate an external stimulator for functional electrical stimulation, on the stimulator itself i can controll Pulse With, and aimplitude. I need there for to send a TTL pulse to activiate the stimulator.

My probem is then i would like to have the ability to stop/start a contenious stimulation with a given pulse rate.

This can be use to send a high low to the stimulator:

outputSingleScan(s,[1])
outputSingleScan(s,[0]) % Can be used to send a single plulse to the DAQ

I dearly i would like to be able to set different Hz for the pulse train, so for instance 35Hz.

With a stop/start option to that section of the code.

Ofcause any alternative solution to this problem is welcome.

Kind regards

Christain