PC 串行接口串口定义(db9)
PC/AT 机上的串行口是 9 针公插座,引脚定义为:
Pin Name Dir 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
并口串口功能引脚一览图:
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