Online switching system and method for RS485 communication

The invention belongs to the technical field of signal transmission, and particularly relates to an RS485 communication online switching system and method, the system comprises a central processing module, a power supply module, a voltage conversion module, a communication module and a plurality of RS485 communication channels, each communication channel comprises an RS485 communication unit, a protection unit and an RS485 repeater; the central processing module is connected to a plurality of external main end devices through the communication module, the central processing module is connected to external slave end devices through the RS485 repeater, the protection unit and the RS485 communication unit in sequence, and the central processing module, the RS485 repeater and the RS485 communication unit are all connected to the power supply module through the voltage conversion module; according to the invention, different Baud rates can be generated according to different receiving and transmitting states, seri