Pinouts
Pinouts for parallel port connectors are:
| Pin No (DB25) | Pin No (36 pin) | Signal name | Direction | Register - bit | Inverted |
|---|---|---|---|---|---|
| 1 | 1 | Strobe | In/Out | Control-0 | Yes |
| 2 | 2 | Data0 | Out | Data-0 | No |
| 3 | 3 | Data1 | Out | Data-1 | No |
| 4 | 4 | Data2 | Out | Data-2 | No |
| 5 | 5 | Data3 | Out | Data-3 | No |
| 6 | 6 | Data4 | Out | Data-4 | No |
| 7 | 7 | Data5 | Out | Data-5 | No |
| 8 | 8 | Data6 | Out | Data-6 | No |
| 9 | 9 | Data7 | Out | Data-7 | No |
| 10 | 10 | Ack | In | Status-6 | No |
| 11 | 11 | Busy | In | Status-7 | Yes |
| 12 | 12 | Paper-Out | In | Status-5 | No |
| 13 | 13 | Select | In | Status-4 | No |
| 14 | 14 | Linefeed | In/Out | Control-1 | Yes |
| 15 | 32 | Error | In | Status-3 | No |
| 16 | 31 | Reset | In/Out | Control-2 | No |
| 17 | 36 | Select-Printer | In/Out | Control-3 | Yes |
| 18-25 | 19-30,33,17,16 | Ground | - | - | - |
Inverted lines are true on logic low. If they are not inverted, then logic high is true.
Pin 25 on the DB25 connector might not be connected to ground on modern computers.
Read more about this topic: Parallel Port