I am having trouble implementing a quadrature encoder for a linear position measurement using a NI 9401 module and a cRIO-9040 chassis.
I currently have channel A wired to pin 14 and channel B wired to pin 17. My 5 VDC supply is from an external 5VDC power supply. I have done the 'Specialty Digital Configuration' through my project > chassis > module > properties and selected 'Quadrature' as the specialty mode. When I read the created Position 1 shared variable, the value is only ever 1 or 0. The Position 2 shared variable seems to do nothing.
I have confirmed through a MAX test panel that PFI0 and PFI2 both register edge counts.
What am I doing incorrectly or have configured inadequately that I am getting a binary value for Position 1, or is this to be expected? I was anticipating this would be some count value that would either increase if A led B, or decrease if B led A, and that I would only have to scale this value to a useable distance.
Thanks in advance.
