Avision AD250F - Manual (Page 82)

User’s Manual
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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.
Note:
1 Within the specified timeout period, if you load your
document to the feeder, the scanner starts scanning
automatically.
2 If your scanner has a flatbed option and you place your
paper on the flatbed, after the timeout period, you need
to click the Scan button on the TWAIN user interface to
start scanning.