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National Instruments Corp.
9
NI 9411 Operating Instructions and Specifications
An example of a differential device is a differential encoder.
A differential encoder has phase A, phase B, and index signals.
Use the phase A signals to meas
u
re rotational speed. Use the
phase B signals to meas
u
re direction. Use the index signals to
meas
u
re the n
u
mber of rotations.
Connect each of the signal pairs of the encoder (phase A, phase B,
and index) to a pair of DI pins. Fig
u
re 3 shows the connections for
one differential encoder.
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