NI 4139 - Exporting an Event to 2 different backplane trigger lines

[teenahaldorai]

I am trying to trigger 2 SMUs by exporting event from 1 SMU. So SMU1's sequence engine done event is exported PXI_Trig1 and SMU1's Start trigger is exported to PXI_Trig2. SMU2 and SMU3 are configured to Start upon receiving triggers from PXI_Trig1 and PXI_Trig2. During one of the test conditions, I would want to export "Start Trigger" from SMU1 to PXI_Trig1. But looks like I can't export a "Start Trigger" event to 2 different PXI backplane trigger lines. Is this correct or am I missing something? Is it possible that I can export a "Start Trigger" event from 1 SMU to 2 different backplane Trigger lines (say PXI_Trig1 and PXI_Trig2)?

[kirsch · Accepted solution]

You're doing it wrong 🙂

Don't export signals from one device to specific PXI Trigger lines only to pull them from PXI Trigger lines in another device.

Instead, pull the signal from the consuming device all the way from the source terminal. NI's routing subsystem will select an available PXI Trigger line for you and make the full trigger route. If your devices are in different segments of an 18-slot PXI chassis, NI's routing subsystem will even program the switches between the PXI Trigger buses in each of the segments on the chassis.

Note: If for some misguided reason you still want to manage PXI Trigger lines yourself (don't) then you can export SMU1's start trigger to PXI_Trig1 (example) and then both consuming devices can pull from it. No need to send to different PXI Trigger lines.