PXIe-7846R Triggering

[Paul_Knight_Lockheed_Mart]

I have two PXIe-7846R running  LabVIEW FPGA code monitoring the PXI_Trig0 line.  I would like the host program to enable the PXI_Trig0 high to start the two FPGAs running their application.  I have a PXIe-8840 controller.  Reading the forums and documentation is appears the a PXIe controller cannot control the PXI_Trig lines.

This that correct?  If not is there an example of a controller programming the lines.  All the examples shows one module triggering another module.

Thanks,

Paul

[KRojas]

Have you check this KB: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000kJ5bSAE&l=en-US ?

[Paul_Knight_Lockheed_Mart]

Yes, that is where I found this:

It is recommended you do not use the PXI controller trig line to trigger your measurement. Instead use another trigger source, such as a software trigger or a hardware trigger from an I/O module with an available counter output.

It is a little bit confusing, since a software trigger is code running on the controller.  Unless they are talking about a software trigger to a module in the chassis that causes it to set the Trig line.

[KRojas · Accepted solution]

You may be right. Take a look at these:

http://www.ni.com/product-documentation/54579/en/

https://forums.ni.com/t5/Example-Programs/Programmatically-Route-PXI-Trigger-Lines-Across-a-Multi-Se...

[Paul_Knight_Lockheed_Mart]

Thanks for you help.  I was able to get the program to work, by using two triggers.  Each PXIe-7846R monitors a trigger that the other PXIe-7846R controls.