The encoder converts angular displacement or linear displacement into electrical signal, the former is called the code disc, the latter is called the code ruler. Encoder compiles and converts signals (such as bit streams) or data into the form of signals that can be used for communication, transmission and storage. According to the readout mode, the encoder can be divided into contact type and non-contact type. According to the working principle, encoders can be divided into incremental type and absolute type.
