串行直連電纜 25針-25針(NullModem)
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串行直連電纜用(yòng)于兩台計算(suàn)機的(de)直接相連，電纜兩端的(de)插頭都是 25 針母插頭：
| 引腳定義 |
| D-Sub 1 | D-Sub 2 | ||
|---|---|---|---|
| Receive Data | 3 | 2 | Transmit Data |
| Transmit Data | 2 | 3 | Receive Data |
| Data Terminal Ready | 20 | 6+8 | Data Set Ready + Carrier Detect |
| System Ground | 7 | 7 | System Ground |
| Data Set Ready + Carrier Detect | 6+8 | 20 | Data Terminal Ready |
| Request to Send | 4 | 5 | Clear to Send |
| Clear to Send | 5 | 4 | Request to Send |