Hello,
Thank you for contacting National Instruments.
PFI0/TRIG1 and PFI1/TRIG2 should operate in the same fashion. You should be able to implement a digital trigger using either connection. A digital trigger will fire when an edge is detected on a particular pin. You can configure a rising or falling edge trigger. The trigger input accepts a TTL level signal which means if you have a rising edge trigger configured, the trigger will fire once the voltage changes from 0V to at least 2V. If this transition occurs the trigger will fire. Therefore, if you have noise spikes on your trigger signal that are large enough to trigger your acquisition, you will need to add some type of filter to remove the high frequencies of the noise. This can usually be acc
omplished with a simple single-pole RC filter.
If you feel confident that your PFI0/TRIG1 pin is damaged, you can return your board to be repaired. However, in most cases you should be able to get by using either PFI1/TRIG2 or one of the other six PFI lines.
Regards,
Bill B
Applications Engineer
National Instruments