Need help with counters on PCI-6221 (37-pin)

Hi all

I have a system with a PCIe 1429 connected to a Basler A504 camera and one I use a clock generator (SRS CG635) of 3.9 kHz for trig the image acquisition.

On the same system that I need to add a PCI 6221 37
PIN
to acquire:

-2 HAVE 39 kHz, synchronized with the acquisition of the image. (Sample of the 10 for each image)

-1 meter to measure a frequency

The accuracy of my clock of 3.9 kHz being much higher than what I have on the DAQ card, I thought that an interesting option would be to have a redeclenchables DAQmx task that generates impulses from 10 to 39 kHz for each pulse received from the clock and then use it to trigger the DAQmx AI task.

Of course this can only work if the 'trigger' sources that I defined for these two tasks do not take both counters that I have on the card.

So, let's describe the DAQmx tasks:

-Here is the one who generates the 39 kHz on 0, the counter of the 3.9 kHz I entered as a source on PFI 4 trig

-This is the task of analog input for which I put the trigger on 6 PFI.

It is: I have "softwarely" know the jury to deliver output (Ctr0) 6 FBP counter? And if so, how?

Thanks in advance for any help!

Maybe you missed something that I didn't really point out in my post.  The method I described would use the external clock of 3.9 kHz precise as a sample clock, so you would * not * be in danger of loss of synchronization in 1 s per day.  You need to only son of this clock signal in a stem of PFI available and configure the task to HAVE it as a result.  The 80 + kHz clock that controls conversions within each sample cycle * would * be generated by the jury of 6221, but he don't would not accumulate any out-of-sync error because he gets "retriggered" on each edge of the 3.9 kHz precise clock.

-Kevin P

Tags: NI Hardware

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