针脚 | 信号 | 定义 | 作用 | 1 | DCD | 载波检测 | Received Line Signal Detector(Data Carrier Detect) | 2 | RXD | 接收数据 | Received Data | 3 | TXD | 发送数据 | Transmit Data | 4 | DTR | 数据终端准备好 | Data Terminal Ready | 5 | SGND | 信号地 | Signal Ground | 6 | DSR | 数据准备好 | Data Set Ready | 7 | RTS | 请求发送 | Request To Send | 8 | CTS | 清除发送 | Clear To Send | 9 | RI | 振铃提示 | Ring Indicator |
|