Generating Single 5 volt pulses with a PCI-6221 card

[UW_Mike]

Hello,

I am currently running Labview 8.5.1 and have recently purchased a PCI-6221 card.

I am trying to figure out the best way to generate single 5 volt pulses.  What I mean by single is that after the 5 volt pulse is generated, I will have another VI perform a task that lasts in the neighborhood of 0.5 to 1.5 secs.  My pulses need to be about 50 us.  I would then need to be able to generate the pulse again after the other VI performs its task.

I have searched the discussion board and have found some helpful example VIs.  Specifically "Generating Digitals Pulse.vi" and "Gen Mult Volt Updates-Int. Clk.vi".  However, I'm still not sure which one would be a good place to start for my application.

Lastly, which pin number would I actually have to wire into to access the 5 V pulse?

Thanks for you help,

Mike 

[kikiduu]

The best way will be to use counter to generate a pulse. Check this example VI.

C:\Program Files\National Instruments\LabVIEW 8.5\examples\DAQmx\Counter\Generate Pulse.llb\Gen Dig Pulse.vi 

the pulse will be generated at the counter output line. if you are using ctr0, then CTR 0 OUT (Pin 2 for 68-pin PCI 6221 card). Ground will be DGND.

You can call this VI multiple times to gnerate pulse after completion of the other VIs.

Message Edited by kikiduu on 01-17-2009 12:47 PM

[UW_Mike]

Thanks kikiduu.

The Gen. Dig. Pulses. vi does not have any front panels for controlling pulse amplitude.  Is this because the pulse that is generated is always a specific voltage and can not be changed?  Also, is the standard pulse a 5 volt pulse?

Regards,

Mike

[kikiduu]

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UW_Mike wrote:

Thanks kikiduu.

The Gen. Dig. Pulses. vi does not have any front panels for controlling pulse amplitude.  Is this because the pulse that is generated is always a specific voltage and can not be changed?  Also, is the standard pulse a 5 volt pulse?

Regards,

Mike

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Mike you are right. The Gen Dig. Puls.vi uses counter to generate pulses. So the output voltage in this case is 5V (TTL) and you cannot vary this.

[UW_Mike]

Thanks again for your help.  I am now working on programming while using the Gen. Dig. Pulse.vi as a starting point.