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differences in DAQmx Trigger (VI)

for the DAQmx Timing VI in sample clock mode

 task in = passed through from DAQmx Create Virtual Channel VI

 samples per channel = 1000

 sampling mode = finite samples (10178)

 sampling rate = 1000

 error in = passed through from DAQmx Create Virtual Channel VI

no other inputs!

no error produced in this VI

 

for the DAQmx Trigger VI in any of the following modes

 - start digital edge

 - reference digital edge

 - start analog edge

 - reference analog edge

 

 task in = passed through

 edge = rising (10280)

 source for digital = PFI0

 source for analog = AI0

 trigger level = 2.5

 pre-trigger samples = 10

no errors produced in this VI

 

DAQmx Read VI in Analog Wfm 1 Chan NSamp mode

 task in = passed through

 timeout = -1

no other inputs!

this VI produces error -200278.  Cannot use continueous (10123) samples in DAQmx Timing VI.

 

Trigger signal is always analog even when inputted into a digital channel.  Signal may look like a digital signal even though is comes from an analog source.  I don't understand what I'm doing wrong.

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