How do I program a NI 6602 card to send trigger pulses triggered by an input digital trigger pulse?

[Claes1981]

Hello,

I want to program a NI 6602 card to send digital output pulses, triggered by one digital input pulse. The first output pulse should be sent 15 microseconds after the input trigger pulse is received, and then up to 6 further digital pulses should be sent on different channels, up to 40 microseconds or more after the trigger input pulse. The accuracy of the time the pulses are sent should be less than 1 microsecond.

Can I use any of the example-VIs which come with the NI-DAQmx 9.7 download? Which one(s)?

Best regards

Claes

[GerdW]

Hi Claes,

the specs for your NI6602 clearly say: "Timing: software" for those digital IO pins.

So it will be hard to automate them to play some pulse patterns using hardware timing...

[Claes1981]

Is that correct that it is not possible to program the hardware of the card for my needs? Under Counter/Timers it at least says "Pulse Generation Yes",  and in the data sheet it is written on page 388 under "Features": ...Each counter has one output that can be routed externally...".

The card only needs to ouput one single pulse on each channel/output after each input trigger pulse. There will be 2-5 milliseconds between each input trigger pulse.

Best regards,

Claes

[Claes1981]

There is a "Counter - Single Pulse Output"-VI that should be able to generate a pulse triggered by an external source. But can I program it to add a 15 (or 20 or 30) microsecond delay?

[Claes1981]

Actually, the "DAQmx Create Virtual Channel"-VI, that is a sub-VI of the "Counter - Single Pulse Output"-VI, has a "initial delay"-input. I will try to use that...

Claes

[Claes1981]

So, I tried the "Counter - Single Pulse Output"-VI, but unfortunately the delay of the ouput pulse does not change, when changing the "initial delay" input variable. Maybe it only affects the first generated pulse...

Claes

[Claes1981]

I eventually managed to generate the pulses by setting the "low time"-input on the "Counter - Single Pulse Output"-VI, to the desired delay. However, it seems to use two counters per output pulse, but I only want one counter to generate each pulse. That should be possible somehow, since the pulse width can be arbitrary short in my case. See my other post: http://forums.ni.com/t5/LabVIEW/How-do-I-program-a-NI-6602-card-to-send-trigger-pulses-one-at/td-p/2...

Claes