Fujitsu ScanSnap iX1600 Basic Operation Manual page 222

4.
In [Scanning side] in the [Scanning] tab, select [Duplex Scan (Double-sided)]
and click the [OK] button.
ATTENTION
If [Simplex Scan (Single-sided)] is selected, the ScanSnap outputs the same result as performing
a simplex scan in [two separate images (front and back)] mode.
5.
Place the document inside the Carrier Sheet.
1. Fold the document in half with the sides to be scanned facing out.
Fold it tightly and smooth out any creases.
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Scanning Documents with iX500