We are trying to arm start trigger with the DAQ board to acquire data from a single photon counter. We developed the code like this: # Create a counter task: readTask = nidaqmx.Task() channel = readTask.ci_channels.add_ci_count_edges_chan("Dev1/ctr0","", initial_count=0, edge=Edge.RISING, count_direction=CountDirection.COUNT_UP) channel.ci_count_edges_term = "PFI0" #Configure start trigger readArmTrig = readTask.triggers.arm_start_trigger readArmTrig.trig_type = TriggerType.DIGITAL_EDGE readArmTrig.dig_edge_src="PFI4" However I don't think the program reads the ci_channel with the trigger we defined. Do anyone know how to enable the arm trigger for a digital counter? Thanks. Jon

Counter/Timer

Counting with Arm Start Trigger with Python - NI-DAQmx

I also had this problem, and am interested to know if you got it to work -- either with the implicit buffered pulse width counting, or with a triggered counter input task?

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Counter/Timer

Counting with Arm Start Trigger with Python - NI-DAQmx

Re: Counting with Arm Start Trigger with Python - NI-DAQmx