Symbol LS 1220, Product Reference Manual

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8-10
LS 1220 Product Reference Guide
Security Options
UPC/EAN Security Level
The LS 1220 offers two levels of decode security for UPC/EAN bar codes. Increasing levels
of security are provided for decreasing levels of bar code quality. There is an inverse
relationship between security and scanner aggressiveness, so be sure to choose only that
level of security necessary for any given application.
• None - The default setting which allows the scanner to operate in its most
aggressive state, while providing sufficient security in decoding “in spec” UPC/EAN
bar codes.
• Check Ambiguous Characters - As bar code quality levels diminish, certain
characters become prone to mis-decodes before others (i.e., 1, 2, 7, 8). If you are
experiencing mis-decodes of poorly printed bar codes, and the mis-decodes are
limited to these characters, select this security level.
• Check All Characters - If you are experiencing mis-decodes of poorly printed bar
codes, and the mis-decodes are not limited to characters 1, 2, 7 and 8, select this
security level.
UPC Security Zone
This parameter is valid only after UPC/EAN Security Level option Check Ambiguous
Characters, or Check all Characters is enabled. If you are still experiencing mis-decodes,
this parameter enhances the security level. The range is from two to ten times. The higher
the number, the greater the level of security. The higher the number, however, the more the
aggressiveness of the scanner is compromised. Conversely, any level below four, in effect,
nullifies the Security Level parameter.
Bi-Directional Redundancy
When enabled, a bar code must be decoded successfully in both directions before
qualifying as a successful decode.