Appendix
Parallel Interface Connector
The printer has a parallel interface for connecting to PC.
Shape of Connector
Signal lines and pin arrangement
No. | I/O | Signal name | No. | I/O | Signal name | ||||
1 |
| I | /STB | 19 |
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| GND | |
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2 | I/O | DATA0 | 20 |
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| GND | ||
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3 | I/O | DATA1 | 21 |
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| GND | ||
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4 | I/O | DATA2 | 22 |
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| GND | ||
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5 | I/O | DATA3 | 23 |
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| GND | ||
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6 | I/O | DATA4 | 24 |
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| GND | ||
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7 | I/O | DATA5 | 25 |
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| GND | ||
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8 | I/O | DATA6 | 26 |
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| GND | ||
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9 | I/O | DATA7 | 27 |
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| GND | ||
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10 |
| O | /ACK | 28 |
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| GND | |
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11 |
| O | BUSY | 29 |
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| GND | |
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12 |
| O | PE | 30 |
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| GND | |
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13 |
| I | SELECT | 31 |
| I | /INIT | ||
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14 |
| O | /AUTOFD* | 32 |
| O | /FAULT | ||
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15 |
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| Not used | 33 |
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| Not used |
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16 |
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| GND | 34 |
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| Not used |
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17 |
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| GND | 35 |
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| Not used |
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18 |
| O | VCC | 36 |
| I | /SELIN* | ||
*Signal used for bidirectional communication
Signal functions
Signal name | Function |
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/STB | Signal for sending data to printer. |
| |
| reads data until this signal becomes |
| from Low to High. |
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DATA0 to | Input signal for receiving |
Data7 | Logic 1 is High. DATA0 is |
| LSB and DATA 7 is MSB. |
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/ACK | Signal indicating that printer has |
| read data into device completely. |
| This signal is output in response to |
| /STB. |
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BUSY | Signal indicating that printer is |
| unable to receive data. Printer is |
| able to receive data when this signal |
| is Low. |
PE | Signal indicating Paper Out of |
| printer. This signal is Low when |
| paper is loaded and is High when |
| paper is out. |
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SELECT | Signal indicating that printer is under |
| online status. Printer is capable of |
| receiving data when this signal is |
| High. |
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/AUTFD | Signal used for bidirectional |
| communication |
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GND | Ground |
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VCC | Signal indicating that the power of |
| printer is on. This signal allows |
| verifying ON/OFF status of power of |
| printer and connection status of |
| printer cable. |
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/INT | Signal for initializing printer. Steady- |
| state value is High. Printer is |
| initialized by Low. |
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/FAULT | Signal indicating that printer is faulty. |
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/SELIN | Signal used for bidirectional |
| communication |
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