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.
从指定的起始点到指定的端点签署位元组阵列。
Signs a byte array from the specified start point to the specified end point.
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