Citizen Systems iDP-3551, iDP-3550 user manual Input and Output Signals, Select

9.3Input and Output Signals

9.3.1Input and Output Signals

(1) Input signals to the printer

•	DATA	: An 8-bit parallel signal. (Active “High”)
•		: A strobe signal to read the 8-bit data. (Active “Low”)
	STB
•		: A signal to reset the printer from the outside. (Active “Low”)
	RESET
(2) Output signals from the printer
•		: An 8-bit data request signal. A pulse signal output at the end of the BUSY signal.
	ACK
		(Active “Low”)
•	BUSY	: A signal to indicate the BUSY status of the printer. Input new data when at "Low".
		(Active “High”)
•		: A signal turned to "Low" when the printer has an alarm. At this time, all the control
	FAULT
		circuits in the printer stop. (Active “Low”)
•	SELECT	: A signal to show whether the printer is selected (On-line) or deselected. (Active
		“High”)

•COMPULSION

:A signal to show the status of the drawer switch. (Active “High”)

•	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 3.3kΩ resistor. (Factory use only)