I need to run AI on a Digital Trigger

[DieselPower]

I am trying to use ContAcqVoltageSamples_ExtClkDigStart.2005

I need to start logging data when a digital channel goes high.  When using this project, I get an error.  I'm assuming that it should start recording when the digital channel goes high, but I could be wrong.

I'm getting an error, attached as a screenshot.

Thanks!

[hoffiz]

Hi Michael,

What board do you have? Form the picture I can tell is a Compact DAQ device but I cannot tell which one?  When dealing with compact cDAQ you module needs to support digital triggering.  I would recommend taking a look at this knowledge base: How Can I Trigger a NI 9233? as reference. Also and it might not be related to your issue but it would give you an insight of the concept take a look at: Does CompactDAQ Support Analog Triggering?

I hope it helps

[DieselPower]

I'm doing AI with the 9239, and the digital trigger with a PCI-6713.

Does these units have their desired capabilities?

[hoffiz]

Hi Michael,

On the documents I gave you it states: “For digital triggering, a module with digital input lines must be added to the CompactDAQ 9172 chassis. For example, use a NI 9205 in slot 5 or 6 and the NI 9233 in any other slot in the same chassis.” So unless you have a card with digital lines the 9239 would not do triggering. The main point here is that the module does not support triggering by itself, since you don’t have access to PFI lines. If the NI 9233 is in a USB carrier, the device cannot be triggered in hardware. Use software to acquire over a period of time and parse the desired signal in post processing.

Now the 6713 is a different card, NI 6711/6713/DAQCard-6715 Specifications and Analog Output Series User Manual.  (Chapter 10 will explaing the triggering capabilities).

I hope it helps