| Service Manuals | Cables & Connectors |
| Pin | Name | Direction | Color | Description |
| 1 | Gnd | Ground | ||
| 2 | +5V | Out | +5 VDC. Don't use this one, it may be converted into output handshake in later equipment. | |
| 3 | Gnd | Ground | ||
| 4 | TX+ | Out | Transmit Data, positive going component | |
| 5 | Tx- | Out | Transmit Data, negative going component | |
| 6 | +12V | Out | +12 VDC | |
| 7 | DSR/HSK | IN | Handshake input. Signal name depends on mode: Used for Flow Control or Clock | |
| 8 | Rx+ | IN | Receive Data, positive going component | |
| 9 | Rx- | IN | Receive Data, negative going component |