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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