The HP Q9874 and Q9898 are optical encoder modules that run on 5v and output quadrature at TTL levels. They have four pins with pin 1 marked with a white dot.

The pinout is
 1=GND
 2=PhaseA
 3=+5V
 4=PhaseB

if you have an heds9000 enocder
 5=Phase B
 4=+5V
 3=PhaseA
 2=Index pulse
 1=GND



encoder pinout, click to enlarge





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