Industrial drives (like servo drives), require accurate, highly reliable, and low-latency position feedback. A simplified system block diagram of a servo drive using an absolute position encoder with EnDat 2.2 bidirectional digital interface. The EnDat 2.2 interface from HEIDENHAIN is a digital, bidirectional interface standard for position or rotary encoders. The interface transmits position values or additional physical quantities. It also allows reading and writing of the encoder’s internal memory. The type of data transmitted like absolute position, turns, temperature, parameters, diagnostics, and so on is selected through mode commands that the subsequent electronics, often referred to as EnDat 2.2 Master, sends to the encoder. The EnDat 2.2 interface is a pure serial digital interface based on RS-485 standard.