The table below provides the connector pin assignments and describes their respective interface signals.
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| Signal | Return | Signal | Direction | Description | ||||
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| pulse to read data. |
| 1 | 19 |
| STROBE |
| IN | STROBE | |||
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| Pulse width must be more | |
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| than 0.5 microseconds at | |
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| the receiving terminal. | |
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| 2 | 20 |
| DATA 1 | IN | These signals represent | ||||
| 3 | 21 |
| DATA2 | IN | information of bits 1 to | ||||
| 4 | 22 |
| DATA3 | IN | to 8 of parallel | ||||
| 5 | 23 |
| DATA4 | IN | data, respectively. | ||||
| 6 | 24 |
| DATA5 | IN | Each signal is at HIGH | ||||
| 7 | 25 |
| DATA6 | IN | level when data is | ||||
| 8 | 26 |
| DATA7 | IN | logical 1 and LOW when | ||||
| 9 | 27 |
| DATA8 | IN | it is logical 0. | ||||
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| OUT | About a 1 | |||
| 10 | 28 |
| ACKNLG | ||||||
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| pulse. LOW indicates that | |
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| data has been received and | |
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| that the printer is ready | |
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| to accept more data. | |
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| 11 | 29 |
| BUSY | OUT | A HIGH signal indicates the | ||||
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| printer cannot receive data. | |
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| The signal goes HIGH in the | |
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| following cases: | |
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| 1) During data entry | |
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| (for each character) | |
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| 2) During printing | |
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| 3) During an error state | |
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| 12 | 30 |
| PE | OUT | A HIGH signal indicates the | ||||
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| printer is in a | |
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| state or in an error state. | |
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| 13 | - |
| SLCT | OUT | Pulled up to 5 V through | ||||
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| 1 .O kR resistance | |
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| 14 | - |
| AUTO | IN | When this signal is LOW, the | ||||
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| FEED |
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| paper is automatically fed | ||
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| XT |
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| one line after printing. | ||
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| (The signal level can be | |
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| fixed to this by setting | |
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| Auto Line Feed to on in the | |
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A - 8 A p p e n d i x