PSC Duet User Manual page 28

To use the scanner in Fixed Mode, place the scanner into the stand.
Make sure it is seated securely. In the Fixed Mode, the scanner can
read bar codes either in the sweep or presentation mode to accom-
modate different user styles.
Sweep Scanning
To perform a sweep scan, move (sweep) the product, with the bar
code facing the front window, laterally through the scan volume. As
shown in Figure 13, the scan volume for fixed scanning extends
approximately 9 inches (23 cm) in front of the scan window.
a. Rear Scan Window
b. Front Scan Window
The optimal scanning distance is at the center of the scan volume, or
approximately 4.5 inches (11 cm) from the window.
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Figure 13. Scan Volume and Scan Depth
c. Scan Volume
d. Scan Depth
Duet ™ Scanner