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设计了一种RS232/RS485的串口通信转换器电路,并且对RS485总线的终端电阻匹配、总线抗干扰措施、上位管理机异地应用的光纤转换传输防雷和RS485总线瞬时失效保护进行了论述。
A RS232 / RS485 serial communication converter circuit is designed, and the terminal resistance matching of RS485 bus, the bus anti-interference measures, the fiber-optic switching transmission lightning protection and the instantaneous fail-safe of RS485 bus are discussed.