Single turn rotary encoder！

In contrast, a single turn, rotary, absolute encoder can report back exactly what angle it’s at even when first powered up. These encoders are typically used for applications in industrial control and robotics that cannot quickly or easily perform a homing sequence. An absolute encoder is like a compass: its exact position is shown when it’s viewed.
A standard absolute encoder has a resolution similar to incremental encoders (ppr, ppi, etc). Instead of an output of high-speed pulse streams, though, the output is
a specified in a binary format. The maximum encoder resolution = 2^n (where n=
number of output wires of the encoder). So, a 4ppr encoder has 2 outputs, an 8ppr encoder has 3 outputs, a 16ppr encoder has 4 outputs, etc. If power is lost, the actual value of the position will be known when power is restored because each location in an absolute encoder’s revolution is a unique binary value.

There’s one drawback to single-turn absolute encoders: the exact angle of the encoder when powered up is evident, but the number of turns made before powering up isn’t. Multi-turn absolute encoders are used to solve this problem.
Multi-turn absolute encoders usually have a battery or super-capacitor that monitors how many revolutions the encoder has turned even while power is off. A multi-turn absolute encoder is like a measuring wheel that increments once per revolution. These encoders typically have serial communication and require special receivers to decode their position information.
In general, incremental encoders must be wired into high-speed inputs (although
there are PPR encoders that don’t produce a high-speed pulse train). Absolute
encoders, however, are designed to be wired to general purpose I/O.

absolute encoder, incremental encoder, hybrid encoder, non-magnetic encoder, multi-turn encoder, multi-turn combination encoder, draw wire encoder, digital readout, linear scale

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