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Parallel Port Pin-Out
EPP was created in 1991
to permit up to 2 Mbps data transfer, and was intended primarily for non-printers.
ECP was created in 1992 to permit higher speed printer communications.
IEEE1284 was created in 1994 to combine EEP and ECP, and relies on the host to determine which standard to use.
| Standard Parallel Port (SPP) | Enhanced Parallel Port (EPP) | Extended Capabilities Port (ECP) | ||||||
| Signal Name | Centronics (36-pin) |
DB-25 (25-pin) |
Signal Name | DB-25 (25-pin) |
Signal Name | DB-25 (25-pin) |
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| Strobe | 1 | 1 | Write | 1 | Host CLK | 1 | ||
| Data 0 | 2 | 2 | Data 0 | 2 | Data 0 | 2 | ||
| Data 1 | 3 | 3 | Data 1 | 3 | Data 1 | 3 | ||
| Data 2 | 4 | 4 | Data 2 | 4 | Data 2 | 4 | ||
| Data 3 | 5 | 5 | Data 3 | 5 | Data 3 | 5 | ||
| Data 4 | 6 | 6 | Data 4 | 6 | Data 4 | 6 | ||
| Data 5 | 7 | 7 | Data 5 | 7 | Data 5 | 7 | ||
| Data 6 | 8 | 8 | Data 6 | 8 | Data 6 | 8 | ||
| Data 7 | 9 | 9 | Data 7 | 9 | Data 7 | 9 | ||
| Acknowledge | 10 | 10 | Interrupt | 10 | Periph CLK | 10 | ||
| Busy | 11 | 11 | Wait | 11 | Periph ACK | 11 | ||
| Paper End | 12 | 12 | Spare | 12 | Ack Reverse | 12 | ||
| Select | 13 | 13 | Spare | 13 | X-Flag | 13 | ||
| Auto Line Feed | 14 | 14 | Data Strobe | 14 | Host ACK | 14 | ||
| Error | 32 | 15 | Spare | 15 | Periph Request | 15 | ||
| Initialize Printer | 31 | 16 | Reset | 16 | Reverse Request | 16 | ||
| Select Input | 36 | 17 | Address Strobe | 17 | 1284 Active | 17 | ||
| Strobe Return | 19 | 18 | Ground | 18 | Ground | 18 | ||
| Data 0 Return | 20 | 19 | Ground | 19 | Ground | 19 | ||
| Data 1 Return | 21 | 19 | Ground | 20 | Ground | 20 | ||
| Data 2 Return | 22 | 20 | Ground | 21 | Ground | 21 | ||
| Data 3 Return | 23 | 20 | Ground | 22 | Ground | 22 | ||
| Data 4 Return | 24 | 21 | Ground | 23 | Ground | 23 | ||
| Data 5 Return | 25 | 21 | Ground | 24 | Ground | 24 | ||
| Data 6 Return | 26 | 22 | Ground | 25 | Ground | 25 | ||
| Data 7 Return | 27 | 22 | ||||||
| Acknowledge Return | 28 | 24 | ||||||
| Busy Return | 29 | 23 | ||||||
| Paper End Return | 28 | 24 | ||||||
| Select Return | 28 | 24 | ||||||
| Auto Line Feed Return | 30 | 25 | ||||||
| Error Return | 29 | 23 | ||||||
| Initialize Printer Return | 30 | 25 | ||||||
| Select Input Return | 30 | 25 | ||||||
| Shield | 33 | N/C | ||||||
| N/C | 34 | N/C | ||||||
| N/C | 35 | N/C | ||||||
Copyright: 1996 - 2026 |
About RF Cafe RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived... |
Copyright 1996 - 2026 All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledge My Hobby Website: My Daughter's Website: |
