Fujitsu scansnap ix500 Operator's Manual page 223

Creating Scanned Images Depending on Intended Use (for Windows Users)
5.
Press the [Scan] button on the ScanSnap to start a scan.
HINT
When you select [Simplex scan] from the Right-Click Menu, scanning is performed in simplex mode
even if [Duplex Scan (Double-sided)] is specified for [Scanning side] in the [Scanning] tab.
Image data of the scanned side of the document is saved.
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