命令字节的最小位是相位指示器，是用来区分一个新的命令还是老命令的重传。
The least significant bit of the cmd byte is the phase indicator, which is used to differentiate a new command from the retransmission of an old one.
命令字节的最小位是相位指示器，是用来区分一个新的命令还是老命令的重传。
The least significant bit of the cmd byte is the phase indicator, which is used to differentiate a new command from the retransmission of an old one.
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