CBM-230/231 User’s Manual

CITIZEN 23
6.3 Input / Output Signals

6.3.1 Input / Output Signals

(1) Input signals to the printer
l DATA : This is an 8-bit parallel signal (Positive logic)
l STB : This is a strobe signal to read in 8-bit data (Negative logic)
l RESET : This signal resets the entire printer (Negative logic) 1 ms or more
(2) Output signals from the printer
l ACK : This is an 8-bit data request signal. Pulse signal output at the end of
the BUSY signal (Negative logic)
l BUSY : This signal indicates the BUSY state of the printer. Enter new data when it is
at LOW. (Positive logic)
l FAULT : This signal is set to low when the printer has an alarm.
When this is done, all control circuits in the printer stop. (Negative logic)
l PE : This signal is output when the printing paper has run out or is running out.
(Positive logic)
l Drawer switch output : This signal is set to HIGH when the switch is opened, and to LOW when shorted.
(3) Power signals
l +5VDC : This is a 5 V output pulled up at a 3.3 k Ohm resistor.
l GND : This is a common ground on the circuits.