Rotary Encoder Incremental Encoder Quadrature Encoder Incremental encoders output quadrature A Quad B signals and may add a marker pulse once per revolution Absolute encoders typically indicate position via a digital message a set of parallel outputs or analog values Face or Flange Mount A machined surface NEMA 56C NEMA FC on the non drive end of the motor is used to mount bearingless or pancake encoders such as Avtron AV56 THIN LINE