Citizen Systems CBM-253 User Manual
Page 41
CBM-253 User’s Manual
29
CITIZEN
Explanation of input and output signals
(1) Input signals
DATA 1~8
: 8-bit parallel signals (Positive logic)
* STB
: Strobe signal used when reading in 8 -bit data (Negative logic)
* RESET
: Signal that reset the whole printer. (Negative logic)
(2) Output signals
* ACK
: This is an 8-bit data requesting signal that is output as a BUSY FAULT PE pulse signal
at the end of the BUSY signal. (Negative logic)
BUSY
: This signal indicates that the printer is in the BUSY condition. New data should be input
when this signal is LOW. (Positive logic)
FAULT
: This signal changes to LOW when the printer is in the alarm condition. At this time, all
of the control circuits in the printer will stop. (Negative logic)
PE
: This signal will be output when the printing paper runs out or runs low. (Positive logic)
COMPULSION : This signal outputs the drawer switch condition. When the switch is open, the signal will
be 'H' , and when the switch is shorted. the signal will be 'L' .
(3) Other signals
+5V
: GND N/C This is a +5V output that has been pulled-up by a 3 .3K resistance.
GND :
This
is
the common ground on the circuit.
N/C
: These pins are not connected.
Receiving control
When the BUSY signal is LOW, it will be possible to receive data from the host. When the BUSY signal is
HIGH, data receiving will not be possible.