Fujitsu ScanSnap S510 Operator's Manual page 193

Operation
4. Load the document onto the ScanSnap.
5. Press the [SCAN] button
⇒
The document is scanned in the "Simplex" mode.
To return the setting to the "Duplex" mode, select [Duplex scan] in Step 2. The
HINT
selected setting is applied to further scans unless it is changed again.
6.1 Using ScanSnap Manager
.
ScanSnap S510 Operator's Guide
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