i need to produce complex signal (attached as image), the signal is a logical "OR" operation of 2 pulse trains, are there any option in labview to produce such signals with PCI-6602 board?
I believe you can do that using Buffered Pulse Train Generation. The X-Series User Manual talks about it on page 7-35 (the subsection on Continuous Buffered Implicit Pulse Train Generation might be the most relevant to your application), and the example "Counter (Buffered) - Continous Output" from the LabVIEW example finder shows this as well.
Regards,
Ryan K. Product Manager, ATCA and BEEcube National Instruments
NI DAQ hardware which supports buffered digital output or buffered counter output could generate that signal, but unfortunately the 6602 supports neither.
If you must use the 6602 you'd have to generate each of the signals using separate counters and OR them together with external hardware.
If low times are identical, it can be done on 6602 using 3 counters:
One counter generates clock at required period,
The second task is retriggered by the first task and it is a finite (2 pulses) counter generation task (uses 2 counters automatically). Idle state High, time low is fixed, High time is small high time on the picture.
Already mentioned X series will be able to do the task using retriggerable delay -it gives 2 different low times
