
9.3Input and Output Signals
9.3.1Input and Output Signals
(1)Input signals to the printer
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| DATA | : An | |||
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| STB | : A strobe signal to read the | ||||
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| : A signal to reset the printer from the outside. (Negative logic) | |||
| RESET |
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(2) Output signals from the printer | ||||||
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| ACK | : An | ||||
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| BUSY signal. (Negative logic) |
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| BUSY | : A signal to indicate the BUSY status of the printer. Input new data | |||
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| when at "LOW". (Positive logic) |
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| FAULT | : A signal turned to "LOW" when the printer has an alarm. At this time, | ||||
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| all the control circuits in the printer stop. (Negative logic) |
·SELECT : A signal to show whether the printer is selected
·COMPULSION
:A signal to show the status of the drawer switch. (Positive logic)
· | PE | : A signal to show that the paper has run out. Normal at the "LOW" level, |
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| but turned to the "HIGH" level when the paper has run out. |
(3) Power related signal | ||
· | GND | : Common ground on the circuits |
· | Vcc | : A +5 V signal. Connected via a 3.3kW resistor. |
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