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Multiple hardware-time-gated edge counting with cDAQ 9188 and NI-9402

Hello! The application I'm going to develop must do the following:

  1. It must open a gate of the device for a certain and reproducable time (order of 100 ms) with a distinct (however, changing from opening to opening) separation between openings (both time-critical, not SW-timed):                      ____~~~~~____~~~~~________~~~~~________________~~~~~___________
  2. While (and in the best case only while) the gate is opened is must count digital edges produced by the same device. A device produces no signals if the gate is closed. While the gate is opened, device produces several digital pulses randomly (!), but not more frequent than once per 50ns (20MHz): _____~_________~_~_~________________~___~___________ Output: 1, 3, 2

What concept would you advice me to use in such application if I have LabVIEW 2013 SP1, cDAQ-9188 chassis and NI-9402 digital I/O module (I can't use "Wait for next sample.vi" according to the help I read, for example)?

 

Any comment will be appreciated!


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