PC串行口引脚定义图

PC串行口引脚定义图

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

PC/XT 机上的串行口是 25 针公插座，引脚定义为：

 

Pin	Name	Dir	Description
1	SHIELD	-	Shield Ground
2	TXD		Transmit Data
3	RXD		Receive Data
4	RTS		Request to Send
5	CTS		Clear to Send
6	DSR		Data Set Ready
7	GND	-	System Ground
8	CD		Carrier Detect
9	n/c	-
10	n/c	-
11	n/c	-
12	n/c	-
13	n/c	-
14	n/c	-
15	n/c	-
16	n/c	-
17	n/c	-
18	n/c	-
19	n/c	-
20	DTR		Data Terminal Ready
21	n/c	-
22	RI		Ring Indicator
23	n/c	-
24	n/c	-
25	n/c	-