Panasonic KX-P2023 Operating Instructions Manual page 64

Interfacing
64
Connector pin signals
STB ... STROBE
• This is a synchronizing input signal to read data into the printer.
• This signal is normally high. Data is read in when it is low.
DATA1-DATA8
• These are the input signals which carry the 8 data bits of information.
• The signal is read in synchronization with the STROBE pulse. A high level indicates a logical 'T.
ACK ... ACKNOWLEDGE
• This is an output signal to the computer indicating that the printer is ready to receive the next data.
When the condition becomes true, the signal goes low.
• The ACK signal is automatically sent whenever the printer is switched ON LINE and the BUSY signal
drops from high to low.
BUSY
• This output signal indicates the status of the printer cannot receive data.
• The signal is high under the following conditions:
1. receive buffer full
2. printer is processing data
3. printer is OFF LINE
4. printer is in an error condition
PO ... PAPER OUT
• This output signal indicates the absence of paper and goes high during a "Paper Out'· condition.
SLCT ... SELECT
• This output signal is high in the ON LINE state and low when OFF LINE.
• The printer enters the ON LINE state:
1. When the printer is turned on
2. when PRIME is received
3. when the RESET command is received
4. when the ON LINE switch is pressed
• The printer enters the OFF LINE state:
1 . when the printer is out of paper
2. when the printer is switched OFF LINE
AUTO FEED XT (AFXT)
• While this input signal is low, one line feed (LF) command will be added to each carriage return (CR).
• Auto LF setting in the Function mode can alter the response by the printer to an AFXT signal. If auto
LF is ON, the printer will perlorm a CR+LF regardless of the level of the AFXT signal. When auto
LF is OFF, automatic action is disabled.