iDP-3420/3421/3423 User’s Manual

9.3Input and Output Signals

9.3.1Input and Output Signals

(1)Input signals to the printer

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DATA

: An 8-bit parallel signal. (Positive logic)

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STB

: A strobe signal to read the 8-bit data. (Negative logic)

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: A signal to reset the printer from the outside. (Negative logic)

 

RESET

 

(2) Output signals from the printer

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ACK

: An 8-bit data request signal. A pulse signal output at the end of the

 

 

 

 

 

 

BUSY signal. (Negative logic)

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BUSY

: A signal to indicate the BUSY status of the printer. Input new data

 

 

 

 

 

 

when at "LOW". (Positive logic)

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FAULT

: A signal turned to "LOW" when the printer has an alarm. At this time,

 

 

 

 

 

 

all the control circuits in the printer stop. (Negative logic)

·SELECT : A signal to show whether the printer is selected (On-line) or deselected. (Positive logic)

·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,

 

 

but turned to the "HIGH" level when the paper has run out.

(3) Power related signal

·

GND

: Common ground on the circuits

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Vcc

: A +5 V signal. Connected via a 3.3kW resistor.

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Citizen Systems iDP-3421, iDP-3420, iDP-3423 user manual Input and Output Signals, · Compulsion