Sensor - Paper End - DCA Intertel 2000 Technical Manual

1.3 Sensor - Paper End

A reflective sensor is used on the MP 2000 to detect the "PAPER END" condition.
When this sensor detects the end of the currently printed sheet, the following takes
place:
a: printing stops
b: the printer switches to "OFF LINE" (ON LINE indicator goes off)
c: PE (Paper End) indicator comes on.
d: carriage moves to middle of the printing span.
In order to resume printing, a new sheet should be loaded and then press the "ON
LINE" button.
When the printer runs out of paper, this condition is signalled via the serial port by
automatically issuing a "status byte" every 100 ms; bit 2 of status will be at logic "1"
as follows:
paper present: bit 2 = PE = 0
out of paper: bit 2 = PE = 1
The "PAPER END" sensor is also used to detect an "open mechanism" condition; in
fact when the mechanism is open the sensor no longer detects the sheet and actions
described in a, b, c and d take place. The carriage moves to the center until a new
sheet is introduced. The printer mechanism is closed and the "ON LINE" push-button is
pressed.
The "PAPER END" sensor can be disabled using control sequence ESC 8; if disabled,
printing can take place even on the bottom edge of the sheet. The disabling sequence
must be done before any out-of-paper condition develops, should the input buffer
contain some unprinted characters, the disabling sequence would only add up in the
queue never to be executed.
The sensor status can be polled at every line by requesting the printer status; when
PE is active, approximately 10 character lines can be printed before the sheet termina-
tes (with 1/6" line spacing).
Paper End Sensor
DCA Intertel 8 DCA Intertel