BD2-2880/2890 User’s Manual
10
6. PARALLEL INTERFACE
6.1 Specifications
Data input method
: 8 bit parallel signal (DATA0~7)
Control signals
: ACK, BUSY, STB, FAULT, PE, RESET
6.2 Explanation of Input/Output Signals
DATA0~7
: 8 bit parallel signal (Positive logic)
STB
: Strobe signal to read 8 bit data (Negative logic)
RESET
: Signal to reset control board (Negative logic)
ACK
: 8 bit data request signal. Pulse signal output at the end of the BUSY
signal (Negative logic)
BUSY
: Signal to indicate BUSY state of the printer. Input new data for “LOW”
(Positive logic)
FAULT
: Signal which is made “LOW” when printer is in alarm state.
(Negative logic)
In this case all the control logics within the printer stop functioning.
PE
: Signal which is output when paper runs out. (Positive logic)
6.3 Electrical Characteristics
(1) Input Signal Level
“HIGH” level
: 0.7 Vcc MIN
“LOW” level
: 0.3 Vcc MAX
(2) Output Signal Level
“HIGH” level
: Vcc - 0.1V MIN
“LOW” level
: 0.1V MAX