User`s manual

iDP3110 User's Manual
CITIZEN
12
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