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PC电脑串行口的典型是RS-232C及其兼容接口，串口引脚有9针和25针两类。而一般的个人电脑中使用的都是9针的接口，25针串行口具有20mA电流环接口功能，用9、11、18、25针来实现。
《串口引脚图》
1 载波检测(DCD)
2 接受数据(RXD)
3 发出数据(TXD)
4 数据终端准备好(DTR)
5 信号地线(SG)
6 数据准备好(DSR)
7 请求发送(RTS)
8 清除发送(CTS)
9 振铃指示(RI)
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 |
- |
|
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接口电路 | 用户分类:
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