User`s manual

CBM-270 User’s Manual
21
CITIZEN
(2) Output signals from the printer
• ACK : 8-bit data request signal. A pulse signal to be output at the end of the BUSY signal
(Negative logic)
• BUSY : Signal to indicate that the printer is busy. Input new data when it is "Low." (Positive logic)
• FAULT : Turned to "Low" when the printer has an alarm. At this time, all the control circuits in
the printer stop. (Negative logic)
• PE : Output if the printing paper has run out or is running out. (Positive logic)
(3) Power source and the related
• +5 V DC : 5 V output pulled up by a 10kΩ resistor
• GND : Common ground for the circuits
6.3.2 Electrical Characteristics
(1) Input signal level
All the input signals are at the TTL level.
High level --- 2.0 V at minimum
Low level --- 0.8 V at maximum
(2) Output signal level
All the output signals are at the TTL level.
High level --- 2.4 V at minimum
Low level --- 0.4 V at maximum
(3) Input and output conditions
The STROBE and RESET input signals are pulled up at 10kΩ, and the other input signals at 50kΩ,
respectively.
[Printer Side] [Host Side]
All the output signals are pulled up at 50kΩ.
[Printer Side] [Host Side]