connector wiring scheme
25 pin D-SUB male
connector
25 pin D-SUB female
connector
| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | GND | - | Ground |
| 2 | SD | OUT | Send Data |
| 3 | RD | IN | Receive Data |
| 4 | RTS | OUT | Request To Send |
| 7 | GND | - | Ground |
| 14 | FAULT- | OUT | False when deselected |
| 20 | DTR | IN | Data Terminal Ready |
Notes
- Direction is Printer relative Computer.