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9针公插座引脚定义
| 引脚 | 定义 | 方向 | 说明 |
| 1 | CD | ← | CarrierDetect |
| 2 | RSD | ← | ReceivEDAta |
| 3 | TXD | → | TransmitData |
| 4 | DTR | → | DataTerminalReady |
| 5 | GND | SystemGound | |
| 6 | DSR | ← | DataSetReady |
| 7 | RTS | → | RequesttoSend |
| 8 | GTS | ← | CleartoSend |
| 9 | RI | ← | RingInDICator |
25针公插座引脚定义
| 引脚 | 定义 | 方向 | 说明 |
| 1 | SHIELD | ShieldGround | |
| 2 | TXD | → | TransmitData |
| 3 | RxD | ← | ReceiveData |
| 4 | RTS | → | RequesttoSend |
| 5 | CTS | ← | CleartoSend |
| 6 | DSR | ← | DaT自SetReady |
| 7 | GND | SystemGround | |
| 8 | CD | ← | CarrierDertect |
| 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 | → | DataTermialReady |
| 21 | n／c | ||
| 22 | RI | ← | RingIndICator |
| 23 | n／c | ||
| 24 | n/c | ||
| 25 | n/c |
