AB 847H-HK2C-RG02048 INCREMENTAL ENCODER , STANDARD SERVO MOUNT , 6 MM DIAMETER SHAFT WITH FLAT , 8-30 VOLT LINE DRIVER,HTL (B-LEADS-A, CW, Z GATED WITH BN) , MS CONNECTOR, 10-PIN WITH MATING CONNECTOR, 2048 PULSES PER REVOLUTION.