Parallel port (DB25) Serial port (9pin)
Serial port (25pin) USB (Universal Serial Bus)
| 1. | STROBE | 11. | BUSY | 21. | GROUND |
| 2. | DATA BIT 0 | 12. | PAPER EMPTY | 22. | GROUND |
| 3. | DATA BIT 1 | 13. | SELECT | 23. | GROUND |
| 4. | DATA BIT 2 | 14. | AUTO FEED | 24. | GROUND |
| 5. | DATA BIT 3 | 15. | ERROR | 25. | GROUND |
| 6. | DATA BIT 4 | 16. | INITIALIZE | ||
| 7. | DATA BIT 5 | 17. | SELECT INPUT | ||
| 8. | DATA BIT 6 | 18. | GROUND | ||
| 9. | DATA BIT 7 | 19. | GROUND | ||
| 10. | ACKNOWLEDGE | 20. | GROUND |
| 1. | CARRIER DETECT |
| 2. | RECEIVE DATA |
| 3. | TRANSMIT DATA |
| 4. | DATA TERMINAL READY |
| 5. | SYSTEM GROUND |
| 6. | DATA SET READY |
| 7. | REQUEST TO SEND |
| 8. | CLEAR TO SEND |
| 9. | RING INDICATOR |
| 1. | SHIELD GROUND | 11. | NOT CONNECTED | 21. | NOT CONNECTED |
| 2. | TRANSMIT DATA | 12. | NOT CONNECTED | 22. | RING INDICATOR |
| 3. | RECEIVE DATA | 13. | NOT CONNECTED | 23. | NOT CONNECTED |
| 4. | REQUEST TO SEND | 14. | NOT CONNECTED | 24. | NOT CONNECTED |
| 5. | CLEAR TO SEND | 15. | NOT CONNECTED | 25. | NOT CONNECTED |
| 6. | DATA SET READY | 16. | NOT CONNECTED | ||
| 7. | SYSTEM GROUND | 17. | NOT CONNECTED | ||
| 8. | CARRIER DETECT | 18. | NOT CONNECTED | ||
| 9. | NOT CONNECTED | 19. | NOT CONNECTED | ||
| 10. | NOT CONNECTED | 20. | DATA TERMINAL READY |
| 1. | +5 VDC |
| 2. | DATA TR |
| 3. | DATA RC |
| 4. | GROUND |