B-3. Connectors and Signals
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| 1 |
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| IN |
| Signals when data is ready to be read. Signal goes from | |
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| STROBE |
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| HIGH to LOW (for at least 0.5 microsec.) when data is |
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| 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 |
| A 9 microsecond LOW pulse acknowledges receipt of | ||
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| ACK |
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| data. |
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| 11 |
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| BUSY | OUT |
| When this signal goes LOW, the printer is ready to | ||||||
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| accept data. When the printer is in one of the conditions |
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| below. “HIGH” is set. |
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| 1. Data being entered. |
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| 2. Off line. |
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| 3. Error condition. |
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| 12 | PAPER OUT | OUT |
| This signal is normally LOW. It will go HIGH if the | |||||||||
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| printer runs out of paper. |
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| 13 | SELECTED | OUT |
| This signal is HIGH when the printer is online. | |||||||||
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| N/C |
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| Not connected | |||||
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| 16 | SIGNAL GND |
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| Signal ground. | ||||||||
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| 17 | CHASSIS GND |
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| Chassis ground, isolated from logic ground. | ||||||||
APPENDIX |
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| 18 |
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| +5VDC |
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| +5VDC (Max 50 mA) | |||||||
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| GND |
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| Twisted pair return signal ground level. | ||||||
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| 31 |
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| IN |
| When this signal goes LOW, the printer is reset to its | |||
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| RESET |
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| 32 |
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| OUT |
| This signal is normally HIGH. This signal goes LOW | ||
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| ERROR |
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| to signal that the printer cannot print due to an error |
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| condition. |
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| Refer to Item |
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| 33 | EXT GND |
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| External ground. | ||||||||
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| 34 |
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| OUT1 | OUT |
| Unused. | ||||||
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| 35 |
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| N/C |
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| Not connected | ||||
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| 36 |
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| The printer side is always set to HIGH. |
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| (19) |
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| (36) | This connector mates with an | |||
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| Amphenol |
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(1) | (18) |
Fig. B-3. Parallel interface connector (printer side)
– 93 –