Quadrature Inputs
By default, the quadrature inputs expect the phase relationship, shown in FIG. 2, for a clockwise rotation of the encoder to generate a positive level change. If the phase relationship does not match the example, a clockwise rotation will generate a negative level change. This can be corrected in two ways:
Inputs A and B can be wired in reverse so the phase relationship is obtained at the quadrature encoder input pins.
Insert a QDIR Send_Command in the NetLinx program.
200 nsec minimum
Input A
Input B
FIG. 2 Quadrature inputs phase relationship for clockwise rotation
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