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9.3 Input and Output Signals
9.3.1 Input and Output Signals
(1) Input signals to the printer
• DATA : An 8-bit parallel signal. (Active “High”)
• STB : A strobe signal to read the 8-bit data. (Active “Low”)
• RESET : A signal to reset the printer from the outside. (Active “Low”)
(2) Output signals from the printer
• ACK : An 8-bit data request signal. A pulse signal output at the end of the BUSY signal.
(Active “Low”)
• BUSY : A signal to indicate the BUSY status of the printer. Input new data when at "Low".
(Active “High”)
• FAULT : A signal turned to "Low" when the printer has an alarm. At this time, all the control
circuits in the printer stop. (Active “Low”)
• SELECT : A signal to show whether the printer is selected (On-line) or deselected. (Active
“High”)
• COMPULSION
: A signal to show the status of the drawer switch. (Active “High”)
• PE : A signal to show that the paper has run out. Normal at the "Low" level, but turned to
the "High" level when the paper has run out.
(3) Power related signal
• GND : Common ground on the circuits
• Vcc : A +5 V signal. Connected via a 3.3kΩ resistor. (Factory use only)