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counting number of pulses of position encoder using NI 9401 with cRIo9073

i am using position encoder of resolution 5.44mm/pulse, i want to count the number of pulses generated by it using cRIO 9073 and NI 9401

 

 

for my positon encoder(attached file) there are three pins

 one is connected to +5v and other ground

the other pin(i.e middle) gives the pulse

 

i checked it in oscilloscope  it  is able to diplay the pulses when the motor is rotating  now i want to count the number of pulses

 

using 9401 ,i used scan mode and enabled 9401 in counter mode

 

please tell me how to proceed further for counting no of pulses given by encoder and

 also tell me is the one pin which gives the pulses is sufficient to connect it to counter

 pin or do i need to connect common pin of NI9401 to ground of

 

 

please help me

powe supply

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