Juniper Mesa 3 Owner's Manual page 27

This menu gives you access to several setting screens.
User Settings
From the menu, select User to open the User Settings screen.
From this screen, set up options like Barcode Scan Time and
which button to use to scan barcodes.
Data Format and Barcode Types
On the Data Format screen, you can set up a prefix and
suffix. Use the rest of the menu options to set up different
types of barcodes, including 1D code types, composite
Codes, postal codes, and 2D code types.
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Chapter 3 Optional Features and Accessories