对强制只听请求(功能代码8,诊断代码4),数据字段的两个字节都不等于0。当由存储器地址地段指定的数据长度比接收到的数据长时,该响应也会发送。查询处理失败错误响应()子码为4的错误响应叫做查询失败错误响应。当一个RTU设备接收到一个查询但不能在相关CPU中通信,CMM失败时,该RTU设备发送这个错误响应。
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