A-B Rockwell Automation 847B-Q326-RB02500. Incremental Encoder, 2" Diameter, Through Hollow, 3 Point Mounting, 3/8 Diameter Hollow Shaft, 8 30 V DC, 8 30V Line Driver (HTL), Radial Exit, M12 8 Pin w/o Mating Connector, A leads B, CW, Z gated with A, 2500 PPR