
Interface Specifications
Printing enabled/disabled signals and control conditions
The table below shows the relationship between printing being enabled or disabled, and the
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| Printing |
SLCT | IN | DCllDC3 | ERROR | BUSY | ACKNLG | |||||||
(Indicator |
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| (Data on/off |
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| (Disabled/ | |
on) |
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| enabled) | |
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Low |
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| DClIDC3 | High | High/Low | Pulsed | ea. | Enabled | |||
| interface) | (no | effect) |
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| char. |
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| (normal | ||
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| cond.) |
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High |
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| DC1 | Recv’d | High | High/low | Pulsed | ea. | Enabled | |||
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| char. |
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High |
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| DC3 Recv’d | High | High/Low | Pulsed | ea. | *Disabled | ||||
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| char. |
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High/Low | DCl/DCB | Low | High | Not |
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| Disabled | |||||
| (no | effect) | (no | effect) |
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*Even though printing is disabled, data characters are received and acknowledged, since the printer is looking for another DC1 character, which would allow it to resume printing.
Serial interface
The LQ
Data format 1 start bit
Data word length: 8 bits Odd, even or no parity 1 stop bit
Signal level
Mark (1) - 3V to - 27V
Space (0) + 3V to + 27V
Band rate
300, 1200, 4800, 9600 BPS