Printer Cover Sensor - Epson TM-L90 Technical Reference Manual

Note:
The detecting the near-end status of the sensor does not necessarily indicate the complete end of the roll
paper. Use the sensor as an indication of replacing a roll paper.
5.2.1.2 Roll Paper End Sensor
The roll paper end sensor is located in the paper path. It detects the presence of paper through
the roll paper in the paper path.
When there is no paper in the path (paper end status), the ERROR LED and the PAPER OUT LED
indicator will light and it will be in the error status.
If the sensor detects the roll paper end, the printer will stop printing even in the process of
printing. It is recommended that you mainly use the roll paper near-end sensor and use the roll
paper end sensor secondarily.

5.2.2 Printer Cover Sensor

5.2.2.1 Roll Paper Cover Open Sensor
The cover-open sensor monitors the roll paper cover. When the sensor detects an open cover
while printing, the printer stops printing immediately and automatically goes offline.
Depending on the Msw 8-8 setting, an open cover error is handled as either a recoverable error
or unrecoverable error as described below.
❏ Msw 8-8 off:
❏ Msw 8-8 on: (Default)
When the printer recovers, it feeds paper to take up the slack, and starts printing from the
beginning of the line where the error occurred. In this case, double printing and printing
position shift may occur. It is recommended to set the memory switch Msw 8-8 to ON, clear the
printer buffers by a command from the driver, and resend the print data.
Whether the cover is open or not does not affect the status reported by the roll paper end sensor.
Note:
When OPOS or Advanced Printer Driver is used, do not change the default setting of the memory switch.
5.2.2.2 Offline
This printer is not equipped with an online/offline switch. The printer goes offline under the
following conditions automatically.
• When the power is turned on (including reset using the interface) and while the printer
is ready to receive data.
92 Application Development Information
Automatically recoverable error. The ERROR LED flashes.
When the printer cover is closed, the ERROR LED goes off,
and the printer goes online and starts printing at the
beginning of the line it was printing when the cover was
opened.
Recoverable error. The ERROR LED flashes. Since the
ERROR LED still flashes after the cover is closed, send the
error recovery command to recover from the error.