Citizen Systems iDP3420, iDP3421, iDP3423 user manual Input and Output Signals

iDP3420/3421/3423 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)
•
	RESET	: A signal to reset the printer from the outside. (Negative logic)
(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 s elected (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
•	Vcc	: A +5 V signal. Connected via a 3.3k Ω resistor.

28 CITIZEN