ContGen-ExtClk-DigStart.prj example is not clear

[haari]

Hi All,

I require some help on DAQmx Triggering concepts.I am using PXI 6229 M-Series DAQ card.I have to write an application in Labwindows/CVI to test digital edge triggering of 6229.

To start with that, I ran the NI example "ContGen-ExtClk-DigStart.prj". 

My doubt is , I have given start trigger source as "PFI1".But I am not generating any signal on PFI1. Without trigger signal how this example is generating waveform?

Can anybody clarify my doubt ?

I am also attaching screenshot of the UI.

Thanks,

Harika

[Kevin_Price]

Well, it *shouldn't* produce any output if no triggering signal is wired or routed to PFI1.  It may display the intended waveform on the UI, but it should not be generating a real signal at ao0.

To test triggering, you'll need to provide a triggering signal.  One way is to wire a digital output bit to PFI1 which you can toggle to cause triggering.

-Kevin P

[Seth_B.]

Kevin is correct.  The graph in the example only displays what the waveform will look like if it is triggered.  It is not showing what is actually being output.  If you measure the analog output channel with an analog input channel, you'll notice that the output doesn't actually happen unless a trigger occurs.

Regards,