If you want to synchronize all of your boards, you can share the scan and/or channel clock and a start trigger. Another option is to export the 20 MHz timebase from the master to slaves, and let the slaves derive their own scan and channel clocks from that timebase. However, you will still need to provide a common start trigger if you want to correlate the data from each board in time.
To export the timebase, you can use Select_Signal with signal = ND_RTSI_CLOCK and source = ND_BOARD_CLOCK to route the master's timebase to the RTSI bus. You then call Select_Signal for each of the slaves and switch the parameters.
You can then program the scan and channel parameters for each device independently. Also, at the end of your acquisition, be sure to call Select_Signal
again to disconnect all of the signals from the RTSI bus.
Hope this helps.
Regards,
Erin