Communication frames begin with a start bit and end with a stop bit.
串口通讯以起始位开始，以终止位结束。
The 'data' line is set inactive when the start bit (always 0) is placed on the 'data' line.
当开始位(总是0)放置到数据线时，数据线被拉低。
In addition, the spacing between the pulses in the start bit allows the receiver to measure the transmission rate; the rate does not need to be fixed in advance.
除此之外，也不必事先固定传输速率，因为接收器可透过起始位元内两脉冲之间的距离，测量出传输速率。
In addition, the spacing between the pulses in the start bit allows the receiver to measure the transmission rate; the rate does not need to be fixed in advance.
除此之外，也不必事先固定传输速率，因为接收器可透过起始位元内两脉冲之间的距离，测量出传输速率。
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