Description Of Input And Output Signals; Input And Output Signals - Citizen iDP3240 User Manual

CAUTION:
• The first letter "n" of each signal name indicates that the signal is active "L".
• If any one of the above signals is not available, bidirectional communication cannot be
accomplished.
• In interfacing signals, be sure to use twist-paired wires for signal lines, and the return
side must be connected to signal ground level.
• All interfacing conditions are specified based on C-MOS level and must satisfy the
following characteristics. Also, specify the rising and falling time of each signal as 0.5
µs.
• Avoid transferring data by ignoring nAck or Busy signal; otherwise, the data may be
erased.
• Make the interface cables as short as necessary.

6.2 Description of Input and Output Signals

6.2.1 Input and Output Signals

Input signals to the printer
• Data:
• nStrobe:
• nInit:
• nSelectIn:
Output signals from the printer
• nAck:
• Busy:
• nFault:
• PError:
• DK_STATUS: This signal becomes "High" when the switch is open, and "Low"
Power related signal
• +5 V:
• GND:
An 8-bit parallel signal. (Active "High")
A strobe signal to help read 8-bit data. (Active "Low")
A signal to reset the entire printer functions. (Active "Low")
This signal is made "High" when the printer is changed to IEEE
1284 mode.
An 8-bit data request signal, which is output at the end of a Busy
signal. (Active "Low")
A signal to indicate a busy state of the printer. Input new data
when this signal is "Low". (Active "High")
This signal becomes "Low" when alarmed. At this time, all control
circuits in the printer are deactivated. (Active "Low")
A signal to indicate that the paper supply has become low or has
run out completely. (Active "High")
when it is closed.
A 5 V signal, which is pulled up by a 3.3 K resistor.
Common ground on circuits.
— 31 —