AMX NetLinx Custom Panel Interface NXP-CPI16 - Manual (Page 8)

4 NXP-CPI16 NetLinx Custom Panel Interface
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.
FIG. 2 Quadrature inputs phase relationship for clockwise rotation
200 nsec minimum
Input A
Input B