C.1. Parallel Interface
Interface Signals
The pins of the parallel interface connector carry the signals listed in Table C.1. Asterisks in the table indi- cate signals that are active low. The table also indicates whether each signal is incoming or outgoing with respect to the printer.
Table C.1. Parallel Connector Pin Assignments
Pin | In/out | Description |
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1 | In | Strobe* [nStrobe] |
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2 | In | Data 0 [Data 1] |
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3 | In | Data 1 [Data 2] |
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4 | In | Data 2 [Data 3] |
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5 | In | Data 3 [Data 4] |
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6 | In | Data 4 [Data 5] |
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7 | In | Data 5 [Data 6] |
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8 | In | Data 6 [Data 7] |
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9 | In | Data 7 [Data 8] |
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10 | Out | Acknowledge* [nAck] |
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11 | Out | Busy [Busy] |
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12 | Out | Paper Empty [PError] |
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13 | Out | |
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14 | In | Ignored [nAutoFd] |
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15 | — | Not connected |
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16 | — | 0V DC |
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17 | — | Chassis GND |
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18 | — | +5V DC |
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19 | — | Ground return |
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20 | — | Ground return |
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21 | — | Ground return |
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22 | — | Ground return |
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23 | — | Ground return |
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24 | — | Ground return |
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25 | — | Ground return |
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26 | — | Ground return |
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27 | — | Ground return |
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28 | — | Ground return |
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29 | — | Ground return |
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30 | — | Ground return |
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31 | In | Reset [nInit] |
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32 | Out | Error*, returns error status if FRPO O2=2 [nFault] |
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33 | — | — |
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34 | — | Not connected |
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35 | Out | Power Ready |
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36 | In | Select In [NSelectIn] |
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[ ]: Signal names in the Auto mode and Nibble (high) mode (IEEE 1284). In the Auto mode and Nibble (high) mode, these signals are