01-29-2022 08:52 AM - edited 01-29-2022 08:53 AM
I want my digitizer to start sampling on "started event" coming from my waveform generator PXI-5441.
PXIe-5172 oscilloscope has RTSI interface. Does that mean it can't listen to PXI-Trigger signals on backplane? If not: What is the recommended way of hardware triggering my scope from a generator event without using front PFI connectors.
I think my generator has no RTSI interface.
I export my event to signal like in attached screenshot.
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01-29-2022 02:24 PM
Definitely possible, this is one way to do it.
Please share more details about the PXI chassis and the slots of these two instruments to decide if you would need additional code.
01-30-2022 04:54 AM - edited 01-30-2022 05:11 AM
Chassis PXIe-1095
Trigger Bus 1 : 1-6 Dynamic
Trigger Bus 2 : 7-12 Dynamic
Generator Slot 9 H
Scope Slot 5
Regarding your example: I think my generator doesn‘t have RTSI interface. You got that?
01-30-2022 09:42 AM
Yes, I do agree that the PXI SCOPE does not have RTSI but I believe it will be equivalent to PXI_TRIGx based on what I observe for FGen.
As per the Scope spec, it does support PXI_TRIG0-6 which maps to RTSI0-6 (if my understanding is correct)
Historically, these PXI instruments were PCI based and hence the driver still calls them RTSI but so far all the instruments I have seen directly map the RTSI number to PXI_TRIG number for PCI/e and PXI/e counterparts.
Now, both your instruments are part of different PXI busses and you need to configure the PXI bridge to route the PXI_TRIG line across.
Since FGen will be the trigger source, configure the PXI_TRIGx as away from Bus 2 in the triggers pane of the PXIe-1095 chassis in NI MAX, this would bridge the PXI_TRIGx line from away from Bus 2 into Bus 1 and 3.
https://knowledge.ni.com/KnowledgeArticleDetails?id=kA03q000000YIIVCA4&l=en-US
01-31-2022 07:50 AM - edited 01-31-2022 07:54 AM
Hey, I am not sure if it works now.
I followed your instructions and I receive a graph. I expect the trigger at around 0 ms. The scope shows the waveform I expect after 0ms. So are those samplings before 0 ms some kind of pretrigger samples?
01-31-2022 10:04 AM
Ok, I had to adjust the reference position in horizontal timing.