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Absolute Encoders Copley Controls Encoder Guide
20 Copley Controls
2.5: EnDat Encoders (Type 11)
This section describes the use of EnDat absolute encoders with Copley Controls drives.
2.5.1: EnDat Encoder and Drive Communication
EnDat encoders can be single or multi-turn. They provide all digital bidirectional communication to
the Copley drive.
The type of transmission (position values, parameters, diagnostics, etc.) is selected by mode
commands that the drive sends to the encoder. The drive can read and update information stored
in the encoder, or save new information. The
encoder’s zero reference point may be set by the
drive. The clock and data are wired as differential pairs.
An Endat encoder transmits data in synch
with the drive’s clock signal.
Because EnDat 2.1 encoders have slow update rates, the transmission of position values require
sin/cos inputs (1V p-p). EnDat 2.2 encoders have fast update rates and do not require sin/cos
inputs.
2.5.2: EnDat 2.2 Encoder Wiring Example
Below is a typical EnDat 2.2 encoder wiring diagram. Use of programmable sin/cos incremental
signals is not required. See data sheets for detailed wiring specifications.