Fujitsu ScanSnap S510M Operator's Manual page 209

5. Select "Duplex Scan" in the [Scanning side] pop-up menu on the [Scanning] tab, and
click the [Apply] button.
Operation
6. Fold the sheet to be scanned in half.
Fold the sheet tightly and smooth out the crease. Otherwise, the sheet may be skewed during
scanning.
6.2 Using the Carrier Sheet
ScanSnap S510M Operator's Guide
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