use PFI 0 line to trigger AI and AO channels on DAQ 6008

[glin2]

Hello,

I am attempting to use the PFI 0 line on the DAQ USB 6008 to trigger an AI and AO channel at a user-specified frequency. The 6008 is not listed as a device that can use the examples I've found so far, but the specification manual does state: 

"When an analog input task is defined, you can configure PFI 0 as a digital trigger input. WHen the digital trigger is enabled, the AI task waits for a rising or falling edge on PFI 0 before starting the acquisition. To use AI Start Trigger (ai/StartTrigger) with a digital source, specify PFI 0 as the source and select a rising or falling edge."

However, it also implies that an exernal digital signal is required for the PFI line. Can I trigger on the 6008 by itself, or do I need an external digital signal? If so, what kind of hardware would I need?

I consider myself pretty new to LabView, so any advice is appreciated.

Thanks!

Gigi

[chaka1234]

Hi glin2,

You could trigger the 6008 by itself by connecting a Digital Output to the PFI line.

Or you could just simply connect a button to the PFI line. You could start acquiring at the fallen edge or the rising edge (it depends on how you configure it).

[glin2]

Hi chaka 1234,

Thanks for the suggestion. Because I'm trying to acquire analog input from channels AI0 and A04, would I just select PFI as the digital trigger source in the DAQ Assistant? OR, do I wire the PFI line to a digital output line, then select that DO line as the digital trigger source for the AI channels? Is there any other "physical" wiring that I would need to do?

Sorry about all the basic questions! 

Gigi

[Dennis_Knutson]

Duplicate
http://forums.ni.com/t5/Multifunction-DAQ/using-PFI-0-line-on-DAQ-6008-to-trigger-analog-acquisition...