描述
PC 串行口定义
PC/AT 机上的串行口是 9 针公插座,引脚定义为:
Pin Name Description
1 CD Carrier Detect
2 RXD Receive Data
3 TXD Transmit Data
4 DTR Data Terminal Ready
5 GND System Ground
6 DSR Data Set Ready
7 RTS Request to Send
8 CTS Clear to Send
9 RI Ring Indicator
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