Avision IS1000 (BF-1008S) - Manual (Page 66)

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Choose “Unknown Length” if you have a batch of long page
document with unknown length. Choose “Enter Length” to
enter the length and width of your documents or your desired
scan size on documents. This is useful when you have a batch
of documents with the same scan size or a batch of same-sized
documents.
OverScan
Overscan allows you to add a specific margin at top and bottom
or right and left (Options vary based on the type of scanner) of
the edge of the image. This is used to reduce possible corner
clipping on the skewed images and often applied to a batch of
skewed document to be scanned in the auto document feeder.
Select a value between 0 and +5 mm. Note the overscan
result will not be shown in the Display window and that the
availability of the function varies based on type of scanner.
Pre-Feed
Choice: Enable, Disable. If enable is selected, you can set the
amount of time the scanner starts pre-feeding your paper after
your documents has been loaded into the feeder. The default is
disable.
Transport Timeout
Set the amount of time the scanner will wait and then start
auto scan after the first scan job is completed. If you have
many separate documents need to be scanned at the same
scan settings, this feature is especially useful. The default is 0.
The value ranges from 0 to 30 seconds.