How to Monitor PFI1 without Polling

[bill.lam@claverham.com]

I am using the PFI1 line to trigger my acquisitions multifunction DAQ board, at the same time I need use the trigger to apply dll function to latch a encoder. what method could I use without polling as time is very critical.

[SachaE]

Hi,
what programming API are you using, and what hardware? I'm assuming e-series DAQ under traditional since you've said PFI1.
You could work with occurences which would work in this case. Under DAQmx however, we don't currently have events, so depending on the version of LabVIEW you're using we might have another option.
For traditional, the available events are going to be 0 - Acquired (or generated) n scans
or if you could work with an analog trigger, then 5 or 6 depending on rising or falling slope trigger.

The following would be a good starting point
http://zone.ni.com/devzone/devzone.nsf/webcategories/61D4A77EDFF4B01686256797004CDD96

If you're using LabVIEW 7.1 and DAQmx however, you can use the new timed loop structure.
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/2d3f6e2f9aaa7b2a86256d600075b88e?OpenDocument

Hope that helps.

Thanks

Sacha Emery
National Instruments (UK)