Describe the different types of encoder outputs！

TTL - are logic gate circuits designed to input and output two types of signal states: high (1) and low (0). The transition between high and low signals generates TTL squarewave outputs.

Open Collector - is a sinking output. In the ‘OFF' state, an open collector will be grounded and in the ‘ON' state, the open collector will float. A sourcing input is required for open collector applications.

Line Driver - is a sourcing output. This means that when in ‘ON' state the line driver will supply Vcc and in the ‘OFF' state the driver will float. A sinking input is required for line driver applications.

Push-Pull - is a combination between a line driver and an open collector. In the ‘OFF' state it will be grounded and in the on ‘ON' state it will supply Vcc.

Incremental encoder and absolute encoder

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