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DYNAMIC RESEARCH CORP Encoder
Brand: DYNAMIC RESEARC CORP -
Code:C25-81B15-2500AG00
| Combination name | Availability | Price |
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Optical Incremental Encoder – DYNAMIC RESEARCH CORP C25-81B15-2500AG00
The C25-81B15-2500AG00 is an optical incremental encoder (“Optical Incremental Encoder”) manufactured by Dynamic Research Corp, designed as a position and velocity transducer for CNC systems and numerically controlled machine tools. The part number identifies a C25-series encoder with a resolution of 2500 pulses per revolution (PPR), type-A output and standard configuration (suffix G00). It provides quadrature signals A, B and zero-pulse Z, compatible with RS-422 / TTL differential interfaces for high immunity to electromagnetic interference typical of industrial environments.
The rotary encoder is the feedback transducer that informs the CNC of the actual position and speed of an axis or spindle: without it the numerical controller cannot close the position loop and the machine is inoperable. A faulty or degraded-signal encoder causes positioning errors, feedback alarms and — in the worst cases — uncontrolled axis motion with collision risk.
Dynamic Research Corp (DRC) was a US manufacturer specialising in optical incremental encoders for motion control and CNC applications, active primarily during the 1980s and 1990s. All products in this line are legacy / discontinued: available only as used spares, NOS (new old stock) or through specialist repair services.
Main Technical Specifications
| Type | Rotary optical incremental encoder |
| Part number | C25-81B15-2500AG00 (C2581B152500AG00) |
| Brand | Dynamic Research Corp (DRC) |
| Known application | CNC machine tools (linear axes, spindle); industrial motion control systems |
| Function | Position and velocity feedback for closed-loop CNC control |
| Resolution | 2500 pulses per revolution (PPR) – 10,000 counts/rev in quadrature (x4) |
| Output signals | Quadrature A, B + zero pulse Z; RS-422 / TTL differential output |
| Supply voltage | 5 V DC (typical) or 5–12 V DC |
| Current / output | ~100–200 mA; differential line driver output |
| Interfaces / Connectors | Multi-pin connector (type and pinout specific to part number; C25-series compatible) |
| Weight | ~0.2–0.5 kg |
| Dimensions | ~Ø60–80 mm, length 60–100 mm |
| Production status | Legacy / discontinued — used/surplus/repair only |
