db9引脚定义
9针RS-232串口(DB9) |
. |
25针RS-232串口(DB25) | ||||
引脚 |
简写 |
功能说明 |
引脚 |
简写 |
功能说明 | |
1 |
CD |
载波侦测(Carrier Detect) |
8 |
CD |
载波侦测(Carrier Detect) | |
2 |
RXD |
接收数据(Receive) |
3 |
RXD |
接收数据(Receive) | |
3 |
TXD |
发送数据(Transmit) |
2 |
TXD |
发送数据(Transmit) | |
4 |
DTR |
数据终端准备(Data Terminal Ready) |
20 |
DTR |
数据终端准备(Data Terminal Ready) | |
5 |
GND |
地线(Ground) |
7 |
GND |
地线(Ground) | |
6 |
DSR |
数据准备好(Data Set Ready) |
6 |
DSR |
数据准备好(Data Set Ready) | |
7 |
RTS |
请求发送(Request To Send) |
4 |
RTS |
请求发送(Request To Send) | |
8 |
CTS |
清除发送(Clear To Send) |
5 |
CTS |
清除发送(Clear To Send) | |
9 |
RI |
振铃指示(Ring Indicator) |
22 |
RI |
振铃指示(Ring Indicator) |