Description of Input / Output Signals | Citizen Systems iDP3110

iDP3110 User's Manual

5.3 Description of Input / Output Signals

(1) Input signal

All input signals utilize type 74HC of CMOS and can be used in TTL level as the input is pulled up with 3.3 kΩ

resistance.
- DATA	8 bit parallel signal (positive logic)
- STB	Strobe signal for reading out data (negative logic)
- RESET	Signal for resetting the entire unit (negative logic 4ms or more)

(2) Output signal

TTL is utilized for all output signals. The output is pulled up with 3.3 kΩ resistance.

- ACK		Signal for requesting data. ACK is issued at the end of the BUSY signal (negative logic)
- BUSY		Signal indicating the printer is busy. Input new data when the signal is in “LOW”
		condition.(positive logic)
- SELECT		Signal indicating the printer is set to a selected condition (on-line). “HIGH” state signifies the
		printer is selected.
(3) Others
- GND	The common circuit ground.
- FG	Equivalent to “case ground”.
∙ Input
[ Printer side ]			[ Host side ]

DATA : 74HC373 equivalent

STB : 74HC14 equivalent

RESET : 74HC04 equivalent

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