描述
西门子S7-200 Smart实现Modbus RTU串口通信从站视频教程：
西门子S7-200 Smart系列PLC做Modbus RTU串口通信从站、Modbus Poll调试助手做Modbus RTU串口通信主站，视频详细讲解了MBUS_INIT和MBUS_Slave指令。
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