Canon imageFORMULA DR-C240 Office Document Scanner - Manual (Page 60)

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When you want to detect multiple pages fed at the same
time
Select the [Double Feed Detection] check box on the [Feeding] tab.
You can enable either one or both of [Detect by Ultrasonic] and
[Detect by Length].
When you want to match the orientation of images to the
text when scanning a mixture of pages with different text
orientations
Select [Text orientation recognition] in [Document Orientation] on the
[Others] tab. The text orientation on each page is detected, and the
scanned image is rotated in 90-degree increments to correct the
orientation.
When you want to rotate the images of a document placed
horizontally to correct the orientation
Specify the rotation angle in [Document Orientation] on the [Others]
tab.