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| Appendix B • Specifications | ||
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| Centronics Parallel Pin Assignments |
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| Pin | Signal | Direction | Description |
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| 1 | Strobe | In | A low pulse greater than 1µs causes the |
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| printer to read one byte of data. |
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| 2 | DATA0 | In | Data Bit 0 |
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| 3 | DATA1 | In | Data Bit 1 |
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| 4 | DATA2 | In | Data Bit 2 |
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| 5 | DATA3 | In | Data Bit 3 |
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| 6 | DATA4 | In | Data Bit 4 |
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| 7 | DATA5 | In | Data Bit 5 |
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| 8 | DATA6 | In | Data Bit 6 |
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| 9 | DATA7 | In | Data Bit 7 |
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| 10 | Acknlg | Out | The printer sends a low pulse to indicate |
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| that it has accepted a byte of data and |
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| is ready for more data. |
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| 11 | Busy | Out | The printer sends a high logic level to |
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| indicate to the host that it cannot receive |
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| data due to data entry, a full buffer or |
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| error condition. |
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| 12 | Paper Error | Out | The printer sends a high logic level to |
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| indicate to the host that it is out of paper. |
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| 13 | On Line | Out | The printer sends a high logic level to |
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| indicate to the host that it is on line. |
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| 14, 15 |
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| Not Used |
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| 16 | Sig Gnd |
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| 17 | Chassis |
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| Gnd |
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| 18 | HI | Out | The printer outputs a high logic level |
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| (+5V through a 2.2K ohm resistor) on this |
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| pin when it is turned on. |
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| Sig Gnd | In |
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| 31 | Reset/Input |
| A low pulse greater than 10µs sent by the |
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| host that resets the printer and clears the |
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| print buffer. |
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| NOTE: The printer may not work when |
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| this line is held low. |
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| 32 | Error | Out | The printer sends a low logic level to the |
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| host to indicate that it is in an error state; |
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| self test failed or carriage position lost. |
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DA300 Printer Operator Guide |