Input and Output Signals, · Compulsion | Citizen Systems iDP-3421

iDP-3420/3421/3423 User’s Manual

9.3Input and Output Signals

9.3.1Input and Output Signals

(1)Input signals to the printer

·	DATA	: An 8-bit parallel signal. (Positive logic)
·
·	STB	: A strobe signal to read the 8-bit data. (Negative logic)
·		: A signal to reset the printer from the outside. (Negative logic)
·	RESET
(2) Output signals from the printer
·
·	ACK	: An 8-bit data request signal. A pulse signal output at the end of the
		BUSY signal. (Negative logic)
·	BUSY	: A signal to indicate the BUSY status of the printer. Input new data
		when at "LOW". (Positive logic)
·
·	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)

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