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out”, load paper into the printer and press the “ON LINE” switch to set the
printer to “ON LINE”.
Mechanical error
Mechanical errors are detected when the motor locks or else and the unit
will not print. Immediately after a mechanical error occurs, the printer sets the
DTR to “MARK” and then sets the printer to “OFF LINE”. To cancel a
mechanical error, close the front cover properly and press the “ON LINE”
switch. If the buzzer sounds and the “ALARM” LED flashes at this time, then
locate the cause of the error and turn the power for the printer off and back on
again to reset the printer.
Framing error
A framing error occurs when “SPACE” is detected at the stop bit. When a
framing error or a vertical parity error occurs for the data which is received, the
printer prints out a “?” mark to indicate that the error occurred.
Cash drawer open detection switch
When pin 6 of the peripheral unit drive circuit connector is set “HIGH”,
status bit 7 becomes “1”.
X-ON/X-OFF Mode
This mode is accessed when the DIP switch 1-5 is OFF. If printer errors
do not occur after the power is turned on, the printer outputs an X-ON (DC1 by
control code; 11H by hexadecimal data) signal on the TXD signal line of the
printer which sends it to the host computer. When the host computer receives the
X-ON signal, the host computer transmits the data to the RXD signal line of the
printer. If data text is not sent from the host computer (even after transmitting
the X-ON signal to the host computer), the printer outputs an X-ON signal at 3
second intervals until the printer receives data. The printer starts outputting an
X-OFF (DC3, 13H) signal when the empty space in the buffer reduces below
256 bytes. When the host computer receives the X-OFF signal, it halts output of
data (however, the printer can continue receiving data until the buffer becomes