A multitype encoder interface design for different applications

Photoelectric platform has important applications in many fields, and the spatial orientation ability is an important function of photoelectric platform, when used in industrial and military areas. As the encoder is a key component in the control loop of the Photoelectric platform, different encoder principles bring different application methods, and a variety of interface forms have to be considered when design the Photoelectric platform. The traditional method is new hardware for each new platform, so there is duplicate design among projects, and the design of multi-axis platforms with multiple interfaces will be more complicated. This article tries to tackle the communication problem of control board with multiple types of encoder with none or little hardware modification. In this paper, the hardware and protocol characteristics of three common encoder interfaces, including ENDAT, SSI and UART, are studied, and an encoder interface control scheme suitable for multi-axis platforms is proposed and verified, which takes FPGA as the core ,can support communicating with multiple devices asynchronously at the same time, and brings good scalability. In this paper, the communication capability of this scheme ,with three common interfaces ,is verified, and ENDAT and SSI timing rates are above 1Mhz, and the maximum baud rate of UART is 921600bps.