无效事务如果在传送期间发生-一个不属于无效查询信息或串行连接暂停类别的错误，该错误就被认为是无效事务。导致-一个无效事务的错误类型包括:Bad CRC.由存储器地址字段指定的数据长度比接收的数据更长。1成帧或运转超限错误奇偶错误如果一个信息被从串口接收时此类别的错误发生，从设备不会返回一个错误信息:从设备忽略引入的信息，处理为好象该信息不是提供给它的。附属程序器的RTU MI P从操作

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