| Описание контакта | Номер контакта PS/2 | Номер контакта COM | Описание контактов COM |
| +5V | 4 | 4 + 7 + 9 | DTR + RTS + RI |
| Data | 1 | 1 | CD |
| GND | 3 | 3 + 5 | TXD + GND |
| Clock | 5 | 6 | DSR |
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