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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