到打印机的插头是 25 针母插头：
9针串口到25针串行打印机电缆
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电缆两端的到计算机的插头是 9 针母插头：
到打印机的插头是 25 针母插头：
| 引脚定义 |
| D-Sub 1 | D-Sub 2 | ||
|---|---|---|---|
| Receive Data | 3 | 3 | Transmit Data |
| Transmit Data | 2 | 2 | Receive Data |
| Clear To Send + Data Set Ready | 8 + 6 | 20 | Data Terminal Ready |
| Carrier Detect + Data Terminal Ready | 1 + 4 | ||
| Ground | 5 | 7 | Ground |