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)
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