The invention relates to the technical field of
encoder communication interface circuits, in particular to a multi-protocol
encoder communication interface circuit based on hardware configuration, which comprises a core control and
protocol processing module, a hardware configuration and mode recognition module, an RS-485 differential driving and receiving module and an interface protection circuit module. In the invention, the problems that the hardware cost is high, the PCB
layout is complicated, the overall size of the
system is increased, the types of connectors are diversified and the wiring difficulty is increased due to the fact that an independent
physical interface circuit needs to be independently designed for each protocol such as BISS and Tamagawa or a special integrated
chip with a solidified factory function is adopted in the existing scheme are thoroughly solved; and meanwhile, the problems that chips need to be replaced or hardware needs to be redesigned and the configuration flexibility is poor in the protocol updating of an existing scheme are solved, the
time sequence conflict risk existing in
software dynamic switching protocols is avoided, and the defects that a traditional circuit is poor in surge resistance,
signal crosstalk is caused and debugging and maintenance are complex are overcome.