A-B Rockwell Automation 847H-HN1A-RH05000. Incremental Encoder, 2.5" Diameter, Solid Shaft, Standard Servo Mount, 3/8 Diameter Shaft with Flat, 4.5 5.5 V DC, 4.5 5.5 V Line Driver (TTL), Radial Exit, MS 10 Pin w/o Mating Connector, B leads A, CW, Z gated with BN, 5000 PPR