Connectors and Signals | |||||||||||
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| Pin No. | Signal Name | IN/OUT | Function | |||||||
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| Signals when data is ready to be read.Signal | |
1 |
| STROBE |
| IN | gose from HIGH to LOW (for at least 0.5 | ||||||
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| microsec.) when data is available. | |
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| These signals provide the information of the | |
IN | first to eighth bits of parallel data.Each signal | ||||||||||
is at HIGH level for a logical 1 and at a LOW | |||||||||||
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| level for a logical 0. | |
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| A 9 microsecond LOW pulse acknowledges | |
10 |
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| ACK | OUT | |||||||
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| receipt of data. | |||||||||
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| When this signal goes LOW, the printer is ready | |
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| to accept data. When the printer is in one of | |
11 |
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| BUSY | OUT | the conditions 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. | |
12 |
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| PAPER | OUT | This signal is normally LOW. It will go HIGH | ||||||
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| OUT | if the 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 |
| Unused | |||||
16 |
| SIGNAL |
| Signal ground. | |||||||
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| GND |
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17 | CHASSIS |
| Chassis ground, isolated from logic ground. | ||||||||
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| GND |
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| 18 |
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| N/C |
| Unused | ||||
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| GND |
| Twisted pair return signal ground level. | ||||||
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| When this signal gose LOW, the printer is reset | |
31 |
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| RESET | IN | |||||||
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| This signal is normally HIGH. This signal goes | |
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| LOW to signal that the printer cannot print | |
32 |
| ERROR | OUT | ||||||||
| due to an error condition. | ||||||||||
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| Refer to Item | |
| 33 | EXT GND |
| External ground. | |||||||
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| N/C |
| Unused. |
Figure 7-3. Parallel Interface Connector (Printer side)
– 25 –