这种串口线用于连接两台针脚数量不一样的rs232接口计算机,串口线头是 9 针母插头,另一头是 25 针母插头如下图片所试:


<9针串口信号定义> <25针串口信号定义>
|
D-Sub 9 |
D-Sub 25 |
|
Receive Data |
2 |
2 |
Transmit Data |
Transmit Data |
3 |
3 |
Receive Data |
Data Terminal Ready |
4 |
6+8 |
Data Set Ready + Carrier Detect |
System Ground |
5 |
7 |
System Ground |
Data Set Ready + Carrier Detect |
6+1 |
20 |
Data Terminal Ready |
Request to Send |
7 |
5 |
Clear to Send |
Clear to Send |
8 |
4 |
Request to Send |
信号简称:TXD、RXD、RTS、CTS、DTR、DSR、DCD、RI、GND
中文串口针脚定义:
9芯 |
信号方向来自 |
缩写 |
描述 |
1 |
调制解调器 |
CD |
载波检测 |
2 |
调制解调器 |
RXD |
接收数据 |
3 |
PC |
TXD |
发送数据 |
4 |
PC |
DTR |
数据终端准备好 |
5 |
|
GND |
信号地 |
6 |
调制解调器 |
DSR |
通讯设备准备好 |
7 |
PC |
RTS |
请求发送 |
8 |
调制解调器 |
CTS |
允许发送 |
9 |
调制解调器 |
RI |
响铃指示器 |
25 针针脚号 |
9 针针脚号 |
缩写 |
全称 |
Pin 2 |
Pin 3 |
TD |
Transmit Data |
Pin 3 |
Pin 2 |
RD |
Receive Data |
Pin 4 |
Pin 7 |
RTS |
Request To Send |
Pin 5 |
Pin 8 |
CTS |
Clear To Send |
Pin 6 |
Pin 6 |
DSR |
Data Set Ready |
Pin 7 |
Pin 5 |
SG |
Signal Ground |
Pin 8 |
Pin 1 |
CD |
Carrier Detect |
Pin 20 |
Pin 4 |
DTR |
Data Terminal Ready |
Pin 22 |
Pin 9 |
RI |
Ring Indicator | |