Abstract
This paper introduces an RS485 bus communication system that can support multi-host online. The communication system is based on the basic communication principle of the single chip microcomputer, combined with the function of the RS485 chip, utilizes the characteristics of the triode, and realizes the communication mode of the multi-host node on the conventional half-duplex master-slave working mode RS485 bus. This key point realization marks the fact that the RS485 bus supporting multi-host node two-way all-digital communication becomes a reality. At the same time, the communication system combines the lightning protection and surge protection requirements, and provides a solid foundation for the RS485 bus fieldbus control system FCS (Fieldbus Control System) based on RS485 bus.
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