25 PIN D-SUB MALE at the printer
| Pin | Name | Dir | Description |
|---|---|---|---|
| 1 | SHIELD | - | Shield Ground |
| 2 | TXD | OUT | Transmit Data |
| 3 | RXD | IN | Receive Data |
| 4 | n/c | - | Not connected |
| 5 | n/c | - | Not connected |
| 6 | DSR | IN | Data Set Ready |
| 7 | GND | - | System Ground |
| 8 | DCD | IN | Data Carrier Detect |
| 9 | n/c | - | Not connected |
| 10 | n/c | - | Not connected |
| 11 | ? | OUT | Reverse Channel |
| 12 | n/c | - | Not connected |
| 13 | n/c | - | Not connected |
| 14 | n/c | - | Not connected |
| 15 | n/c | - | Not connected |
| 16 | n/c | - | Not connected |
| 17 | TTY-TXD | OUT | TTY Receive Data |
| 18 | n/c | - | Not connected |
| 19 | n/c | - | Not connected |
| 20 | DTR | OUT | Data Terminal Ready |
| 21 | n/c | - | Not connected |
| 22 | n/c | - | Not connected |
| 23 | ? | OUT | TTY Receive Data Return |
| 24 | ? | IN | TTY Transmit Data Return |
| 25 | TTY-RXD | IN | TTY Receive Data |