Get list of available triggers sources from DAQmx

[VIGuy]

If you are setting up an acquisition task in NI-Max, on the "Triggering" tab, if you select "Digital Edge" from "Trigger Type" on the right a new control will appear and let you select from a list of choices like "/Dev1/PFI1".

How can you programmatically get a list of these values in LabVIEW?

I know that list of type "DAQmx Terminal" from the "I/O -> DAQmx Name Controls" LabVIEW pallet. It's also known as "NI Terminal" in the floating help window.

The "DAQmx Terminal" control does not have a property node for this, nor does it have an invoke node. The DAQmx function pallet has property nodes for channels and physical channels, but not one for terminals.  The property for 'Device' doesn't provide anything either.

I've found the functionality I need in the .NET NationalInstruments.DAQmx assembly:

DaqSystem.Local.LoadDevice().GetTerminals()

Beside it being .NET (I don't want to make the .NET framework a installation requirement for one measely function call), it is not ideal because it only works if it is only ran once in LabVIEW.  If you use it a second time it throws an error stating "You may only create one instance of a type of Query List once during the lifetime of your application." (LabVIEW 8.5 Example attached)

So, again, How can you programmatically get list of available triggers sources from DAQmx in LabVIEW?

Thanks for the help.

[stilly32]

Hey,

I think you'll find what you need in the DAQmx Devices property node - one of the properties is the Terminals (the same property you found in the .NET assembly). 

Please post back if this isn't what you're looking for. 

Andrew S

Message Edited by stilly32 on 11-05-2008 11:41 AM

Message Edited by stilly32 on 11-05-2008 11:41 AM

[VIGuy]

I don't have that option on my property node.  Even your VI is broken. 

What version of LabVIEW and what version of DAQmx?

[stilly32 · Accepted solution]

Hmm, we did add a lot of device properties in DAQmx 8.0 and 8.3 I believe, I'm not sure when we added the Terminals property. I'm using DAQmx 8.8 and LV 8.6 (saved it back for 8.0 just in case).

Are you able to upgrade your version of DAQmx? - that would be what is controlling the property availability rather than LabVIEW version.

Cheers,

Andrew S 

[VIGuy]

I have DAQmx 8.6, so that's probably the difference.

Thanks for your help.