 25 pin D-SUB male connector at the printer | | Pin | Name | Dir | Description |
|---|
| 1 | SHIELD |  | Shield Ground |
| 2 | TXD |  | Transmit Data |
| 3 | RXD |  | Receive Data |
| 4 | n/c | - | Not connected |
| 5 | n/c | - | Not connected |
| 6 | DSR | | Data Set Ready |
| 7 | GND | | System Ground |
| 8 | DCD | | Data Carrier Detect |
| 9 | n/c | - | Not connected |
| 10 | n/c | - | Not connected |
| 11 | ? | | 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 | | TTY Receive Data |
| 18 | n/c | - | Not connected |
| 19 | n/c | - | Not connected |
| 20 | DTR | | Data Terminal Ready |
| 21 | n/c | - | Not connected |
| 22 | n/c | - | Not connected |
| 23 | ? | | TTY Receive Data Return |
| 24 | ? | | TTY Transmit Data Return |
| 25 | TTY-RXD | | TTY Receive Data |
| |
