5.3Explanation of Input/Output Signals
1) Input Signals into Printer
| DATA 1 | 8 bit parallel signal (positive logic) | ||
| DATA 2 | 8 bit parallel signal (positive logic) | ||
| DATA 3 | 8 bit parallel signal (positive logic) | ||
| DATA 4 | 8 bit parallel signal (positive logic) | ||
| DATA 5 | 8 bit parallel signal (positive logic) | ||
| DATA 6 | 8 bit parallel signal (positive logic) | ||
| DATA 7 | 8 bit parallel signal (positive logic) | ||
| DATA 8 | 8 bit parallel signal (positive logic) | ||
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| Strobe signal to read 8 bit data (negative logic) | |
| STB | |||
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| RESET | Signal to reset the whole printer (negative logic) | ||
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| 4 ms or more |
2) Output Signals from Printer | ||||
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| 8 bit data request signal (negative logic) | ||
| ACK | ........................ | ||
| BUSY | Signal to show BUSY state. Input new data at "LOW" (positive logic) | ||
| PE | Signal to indicate shortage of paper (positive logic) | ||
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| Signal to indicate occurrence of trouble, such as mechanical al arm (positive logic) | |
| FAULT | .................... | ||
23 | CITIZEN |