The SRE rotary encoder is a high-performance optical incremental encoder, which delivers two count channels in quadrature (called A and B) as output signals, plus a third index signal. The two output waveforms are 90 degrees out of phase and indicate both the position and the direction of rotation: if A leads B, for example, then the rotor rotates in counterclockwise direction. Otherwise, if B leads A, then the rotor rotates in clockwise direction. These encoders can be easily installed in order to satisfy the customer’s requirements.
SRE-17 Series Rotary Encoder Datasheet