RS485 serial port and multimode time synchronization circuit matching device

The utility model discloses an RS485 serial port and multimode time synchronization circuit matching device which comprises a main board and an auxiliary board. Wherein the mainboard comprises an electric B code time synchronization module and a decoding control module; the auxiliary board comprises an optical B code time synchronization module and an RS485 serial port module. The electric B code time synchronization module is used for converting an electric B code signal sent by an electric B code input source into a first TTL (Transistor-Transistor Logic) level signal and sending the first TTL level signal to the decoding control module; the optical B code time synchronization module is used for converting an optical time synchronization pulse signal input by an optical fiber into a second TTL level signal and sending the second TTL level signal to the decoding control module; the decoding control module is used for decoding the first TTL level signal and the second TTL level signal to obtain time informati