C-2. Function for Compatibility Mode
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| Signal Name | IN/OUT | Function |
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1 |
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| IN | Signals when data is ready to be read. Signal goes |
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| STB |
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| from HIGH to LOW (for at least 0.5 microsec.) when |
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| the data is available. |
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| IN | These signals provide the information of the first to |
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| eighth bits of parallel data. Each signal is at HIGH level |
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| for a logical 1 and at a LOW level for a logical 0. |
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10 |
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| OUT | LOW pulse acknowledges receipt of the data. |
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| ACK OUT |
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11 |
| BUSY OUT | OUT | When this signal goes to LOW, the printer is ready |
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| to accept data. When the printer is in one of the |
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| conditions below, “HIGH” is set. |
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| 1. Data is being entered |
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| 2. Off line |
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| 3. Error condition |
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12 |
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| PE OUT | OUT | This signal indicates the status of the paper sensor. |
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13 | SELECT OUT | OUT | This signal is HIGH when the printer is online. |
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14 |
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| AUTO IN | IN | This signals that the printer is processing a paper |
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| feed command from a host computer. |
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15 |
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| NC |
| Unused |
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16 |
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| GND |
| Signal ground |
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17 |
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| FG |
| Chassis ground, isolated from logic ground |
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| APPENDIX | ||||||||||||||
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18 |
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| Logic High |
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| GND |
| Twisted pair return the signal to ground level. |
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31 |
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| IN | When this signal goes to LOW, the printer is reset to |
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| INT IN |
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| its |
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32 |
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| OUT | This signal is normally HIGH. This signal goes to |
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| ERROR OUT |
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| LOW to signal that the printer cannot print due to an |
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| error condition. |
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33 |
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| GND |
| External ground |
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34 |
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| DKSTS | OUT |
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35 |
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| Logic High |
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36 |
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| IN | Puts printer in Select mode |
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| SELECT IN |
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This connector mates with an
Amphenol
Parallel interface connector (printer side)
– 95 –