Fujitsu scansnap ix500 Operator's Manual page 382

Creating Scanned Images Depending on Intended Use (for Mac OS Users)
5.
Load a document in the ScanSnap.
For details, refer to
6.
Press the [Scan] button on the ScanSnap to start a scan.
HINT
When you select [Simplex scan] from the ScanSnap Manager 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.
"How to Load Documents" (page
382
63).