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Incremental Rotary Encoder – SANYO DENKI RST-4XC-II
The RST-4XC-II is an incremental rotary encoder (“Incremental Rotary Encoder”) manufactured by SANYO DENKI, designed as a position and speed transducer for CNC servo axes and industrial motion control systems. It provides the feedback signal to the servo drive, enabling closed-loop regulation of motor position and speed. The designation RST-4XC-II identifies the second revision of the RST-4XC series; connector variants and exact resolution must be confirmed on the manufacturer’s datasheet.
The encoder is the transducer that closes the position and speed loop in the CNC servo axis: it converts motor shaft rotation into digital pulse trains that the drive and CNC controller use to determine exact position and speed. Without it, the servo motor cannot operate in closed loop; axis control becomes unreliable and any precision machining is impossible.
SANYO DENKI is a Japanese manufacturer founded in 1927, specialising in motion control systems, AC/DC servo motors, rotary encoders, industrial fans, and UPS systems. Its products are widely used in CNC machinery, robotics, and industrial automation worldwide. The RST-4XC family belongs to a mature product line; revision II is legacy / discontinued — available as used, surplus, or through specialist repair.
Main Technical Specifications
| Type | Incremental rotary encoder |
| Part number | RST-4XC-II (RST4XCII) |
| Brand | SANYO DENKI |
| Known application | CNC servo axes and industrial motion control systems; feedback on SANYO DENKI servo motors |
| Function | Incremental position and speed feedback for CNC servo drives |
| Resolution | To be confirmed on datasheet (typical RST series: 1,000–2,500 PPR) |
| Output signal | RS-422 differential line driver: A, /A, B, /B, Z, /Z |
| Supply voltage | 5 V DC ±5% |
| Interfaces / connectors | Multi-pin plug connector (type and pin-out to be confirmed on datasheet) |
| Maximum speed | ~3,000–6,000 rpm |
| Operating temperature | 0–60 °C |
| Weight | ~0.2–0.5 kg |
| Dimensions | ~ø60–90 mm, length ~60–120 mm |
| Production status | Legacy / discontinued — available as used, surplus, or through specialist repair |