User`s manual

CBM-292/293 User’s Manual
32 CITIZEN
7. PARALLEL INTERFACE
7.1 Specifications
Data input system : 8-bit parallel system(DATA0
∼
7)
Control signals : ACK, BUSY, STROBE, FAULT, PE, RESET
7.2 Input and Output Signals
•
DATA0
∼
7 : An 8-bit parallel signal.(Positive logic)
•
STROBE : A strobe signal to read the 8-bit data.(Negative logic)
•
RESET : A signal to reset the entire control board.(Negative logic)
•
ACK : An 8-bit data request signal.
A pulse signal to be output at the end of the BUSY signal.(Negative logic)
•
BUSY : A signal to indicate the BUSY status. Input new data when "LOW."
(Positive logic)
•
FAULT : A signal turned to "LOW" in case of the alarm status.(Negative logic)
•
PE : A signal to be output when the printing paper runs out.(Positive logic)
7.3 Electrical Characteristics
(1) Input signal levels
"HIGH" level : 0.7Vcc at minimum
"LOW" level : 0.3Vcc at maximum
(2) Output signal levels
"HIGH" level : Vcc-0.1V at minimum
"LOW" level : 0.1V at maximum
(3) Input/output conditions
The STROBE and RESET input signals are all pulled up at 3.3k
Ω
. The others are pulled up at 50k
Ω
.
[Printer Side] [Host Side]
All the output signals are pulled up at 50k
Ω
.