I am attempting to synchronize analog input tasks on two 9188 chassis utilzing the build in BNC ports (PFI 0 and 1). I also have digital input tasks on the master chassis that I would like to synchronize. I have been referencing https://www.ni.com/en/support/documentation/supplemental/21/signal-based-synchronization-of-analog-i... and examples but am not certain I have it setup correctly.
From the link above, I have exported the SampleCLK to PFI0 and the StartTrig to PFI1 on the master chassis. I have two BNC cables routed between the ports on the two chassis. I have set the DAQmx Start Trigger on the slave to source to PFI1 (This does seem to make the two task start at the same time), I have attempted to set the DAQmx timing ( Sample Clock) to source PFI0, but this creates an error (Requested Sample clock source is invalid).
I can get the test application to run by seting the slave sample clock source to "OnboardClock". When I use this setting, the two task seem to start at the same time, but I do not believe the slave chassis is using the master module sample clock and therefore could drift with time?
I would like to know how to properly sync the two analog tasks. I would also like to sync the digital tasks on the master chassis with the analog task.
