System Wide RTSI Trigger - Multiple Instrument​s

Question

Hello,
The application design requires a group of VIs whose job is to select a test point, look up what device and channel it is connected to, and then assign it as a trigger on the RTSI bus. The four instruments will then use this RTSI channel as a system wide trigger.
For example, can a VI assign Channel 3 on Device 1 as a trigger on RTSI Channel 0; then a completely separate VI that contains the driver for Device 1 (and is responsible for data acquisition) utilizes RTSI 0 as it's trigger (the same trigger that it is supplying)? There are four instruments, and the trigger can be selected from any channel on any of these instruments.
Or, does the trigger have to be set at the time of acquisition, t
herefore, amidst initializing the driver?
Thanks for your help!
Mark Roberto
MD Robotics

Answer 1

Mark,
Here is how you can setup were to look for triggers. When we set a DAQ board to trigger we use Trigger Config VI which can be found in the advanced pallettes for Analog Input, Analog Output, and Digital I/O.
When we want to route the trigger setup in Trigger Config to the RTSI bus to make the signal available to other DAQ boards then we use Route Signal for E-series and Analog output boards or RTSI Connect for 653x boards.
Regarding he question about assigning channel 3 on Device 1 as a trigger on the RTSI channel, this is not directly possible.
The RTSI bus only takes digital signals and therefore you can not route an Analog signal on channel 3 to the RTSI bus. However you can setup Device 1 to trigger off an analog trigger (if the DAQ board supports Anal
og Triggering) and then pass the digital trigger that is set over the RTSI bus.
When you set up analog triggering you can only specify the first channel in your channel string as the analog trigger source. In this case you can not monitor 4 channels and trigger when either of the 4 channels reach a trigger condition. You can only monitor one channel for the trigger condition.