How do I use the marker output of a 5411 Arb to trigger my data acquisition?

[mcrobert]

Can anyone explain the proper method for routing the marker output of the 5411(PXI version) to the RTSI bus for triggering data acquisition? I have tried the NIFGEN Route Signal Out.vi without much luck. Is there a better method?

[cld]

mcrobert,

The main thing to make sure of is to unroute the signals to RTSI0 using the NIFGEN Route Signal Out.vi and then follow up routing the marker to RTSI with the same vi. Attached is an example using an arbitrary waveform from text file, markers and routing to RTSI. I tested it here and it worked fine.

Best Regards,
Chris D
NI Applications Engineer

[mcrobert]

Hi Chris. Thanks for the answer. However, I am currently running LabVIEW 6i and cannot open the vi you attached. But, I think that I know where I am going wrong. Are markers only used when in Arb mode? For my application we are using DDS mode to generate a swept sine wave and the SYNC output to trigger the data acquisition. I was hoping to find a better method to trigger our 6115, and thought that maybe markers was the way to go. Could I also route the SYNC output to the RTSI bus?

Thanks.
Rob

[JerryAL]

Hi Rob

Markers are only supported for Arb Mode of the NI 5411. The nature of DDS makes it very difficult to know when a sample has been generated, as many are skipped, depending on the frequency set.

Yes, you can route the SYNC pulse to RTSI. Using the same Route Signal VI. There should be an option there for SYNC.

Jerry