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DETAILED SECTION DESCRIPTIONS
October 9th, 1995
SCANNER PROCESS
2. Read Size Command, Auto Size Mode
If selected, this is done after Initialization.
2-1. Read Size Command
If the scanner receives the Read Size Command in book mode, it detects the
size in the main scan direction as described above.
The scanner sends the width data to the host computer.
2-2. Auto Size Mode
This mode can be set with the Set Window command, which is invoked by
the driver software.
If the scanner is set in the Auto Size Mode with DIP switch #2 turned off (Pre
Scan Mode), it detects the document size in both main and sub scan
directions.
If the scanner is set in the Auto Size Mode with DIP switch #2 turned on
(Standard Size Detection Mode), it detects the document size only in the
main scan direction. The scanner determines that the document length is the
same as for a standard paper size of the same width.
Note: The scanner always assumes the paper is in a lengthwise orientation
(i.e., the main scan is the short side). Also, in USA models, if Letter width is
detected, the paper is always assumed to be Letter size (the last few inches
of a Legal-size original will not be scanned).
After detecting the document size, the scanner scans the detected area.
3. ABORT Command
This can occur at any time during the basic scanning procedure.
If the ABORT command is received during scanning, the scanner motor is
stopped. Then the carriage returns to the home position ([B] in the diagram at
the start of section 2.2.1).
If this command is received while the carriage is reversing or checking the
home position, the operation is not interrupted.
2-8
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