描述
施耐德Modicon TM218实现Modbus RTU串口通信主站视频教程：
施耐德Modicon TM218做Modbus RTU主站、Modbus Slave调试助手做Modbus RTU从站，视频详细讲解了ADDM、READ_VAR和WRITE_VAR指令，程序实现了02、15、03和16功能码。
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