PSC Duet User Manual page 24

You have completed the scanner installation and power-up proce-
dures. If problems occur, follow the procedures titled Problem
Isolation on the next page.
If you want to modify the scanner's interface parameters or change
the user interface (e.g. speaker tone length), order the Duet scanner
Programming Guide (PSC Part Number R44-1740).
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Duet ™ Scanner