Our quadrature encoders feature two physical tracks, which generate three signals. One track generates two of the signals, A and B. These signals are phased in quadrature and carry both position and direction information.
The second track generates the third signal; this signal changes state only once per revolution, and defines a unique point in the rotation. The mark on the second track which generates the state change is called the index mark. The index signal is often used to define a home position when used in conjunction with an external switch wired to one of the I/O. See the I and RI commands for details about how the SmartMotor handles its index signal in software.
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