connector wiring scheme
9 pin D-SUB male connector
9 pin D-SUB female
connector
| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | GND | - | Ground |
| 2 | n/c | Not connected | |
| 3 | GND | - | Ground |
| 4 | TXD+ | OUT | Transmit Data + |
| 5 | TXD- | OUT | Transmit Data - |
| 6 | n/c | Not connected | |
| 7 | RXCLK | OUT | TRxC of Zilog 8530 |
| 8 | RXD+ | IN | Receive Data + |
| 9 | RXD- | IN | Receive Data - |
Notes
- Direction is Printer relative Computer.