PC/AT 機上的串列口是 9 針公插座，引腳定義為：
| 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 機上的串列口是 25 針公插座，引腳定義為：
| 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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