Star Micronics SP298 user manual English, Paper Sensors

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Paper Sensors

The following paper sensors are available.

❏TOF Sensor

This top-of-form sensor detects the leading edge of the paper.

When enabled, the TOF sensor detects when there is no paper present and stops printing.

❏BOF Sensor

This bottom-of-form sensor detects the trailing edge of the paper. When enabled, the BOF sensor detects when there is no paper present and printing is interrupted.

When the TOF or BOF sensor detects that no paper is present, the printer stops its motor after printing of 0 to a maximum of two more lines.

The BOF sensor detects a paper out condition whenever the distance between print head pin #9 and the trailing edge of the paper becomes 38.1 mm or less. In the Star Mode, this enters the print stop operation, but in the ESC/POS Mode, the print stop operation is not entered until the distance between print head pin #9 and the trailing edge of the paper becomes 27.3 mm or less.

When the auto clamp is enabled with Memory Switch 5-1, the auto clamp operation is performed about 0.7 second (initial default in Star Mode; ESC/POS Mode initial value is approximately 1 second) after the presence of paper is detected both by the TOF and BOF sensors, following a paper out condition. The auto clamp function is not affected by whether the TOF or BOF sensor is enabled or disabled.

The top of form positioning function is enabled with Memory Switch 5-0. Even if the auto clamp function is disabled, auto top of form positioning is performed if the paper is clamped when printing starts.

The PAPER OUT lamp flashes to request insertion of paper when the sensors detect there is no paper (when a sensor enabled by command detects no paper) after data is received by the printer. At that time, the user inserts paper, and printing begins after the sensor detects that paper is present.