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ModbusTCP监控程序

于 2022-06-17 发布 文件大小:11.98 kB
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资源描述 这里先传个代码的文件先看看吧。TCP的协议样例如下: 请求和响应带有六个字节的前缀,如下: byte 0:     事务处理标识符 –由服务器复制 –通常为 0 byte 1:     事务处理标识符 –由服务器复制 –通常为 0 byte 2:     协议标识符= 0 byte 3:     协议标识符= 0 byte 4:     长度字段 (上半部分字节) = 0 (所有的消息长度小于256) byte 5:    长度字段  (下半部分字节)   = 后面字节的数量 byte 6:    单元标识符 (原“从站地址”) byte 7:       MODBUS 功能代码 byte 8 on:       所需的数据   因而处理示例“以4的偏移从UI 9读1寄存器”返回5的值将是

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