命令代码和字节计数上面必须发送，但数据是这两个字节被忽略。

The Command code and byte count shown above must be sent, but the data is ignored for those two bytes.

youdao

命令代码和字节计数上面必须发送，但数据是这两个字节被忽略。

The Command code and byte count shown above must be sent, but the data is ignored for those two bytes.

youdao