A 0 bit is represented by an impulse followed by a pause; a 1 bit is a pause followed by an impulse; a start or stop bit is a pair of impulses.
A 0 bit is represented by an impulse followed by a pause; a 1 bit is a pause followed by an impulse; a start or stop bit is a pair of impulses.
0表示一单位脉冲加上一单位暂停；1则为一单位暂停加上一单位脉冲；起始或结束位元，则为两单位脉冲。