Pin No. | Direction |
| IEEE |
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| Compatibility |
| Nibble |
| ECP |
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18 | OUT |
| PeripheralLogicHigh |
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19 - 30 |
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| GND |
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31 | IN |
| nlnit |
| nReverse | |
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| Request |
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32 | OUT | nFault |
| nDataAvail |
| nPeriphRequest |
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33 |
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| GND |
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34 |
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| NC |
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35 | OUT |
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| +5V |
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36 | IN | nSelectln |
| IEEE1284 Active | ||
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Note:
The column heading ”Direction” refers to the direction of signal flow in A to or out of the printer.
nStrobe/HostClkCompatibility mode: Latch pulse used to read in print data. When low, DATA is valid
Negotiation phase: Latch pulse used to read in extensibility request values
Nibble mode: Always high
ECP mode: Used to transfer data and addresses from the host to the printer with handshaking via PeriphAck (Busy)
DATA1 to DATA8 (bidirectional, but may always be an input if ECP or EPP mode is not supported)
Compatibility mode: Forward channel data
Negotiation phase: Extensibility request value
Technical Specifications |