8 - 28 LI2208 PRODUCT REFERENCE GUIDE
Code 128 Security Level
Parameter # 751
Code 128 bar codes are vulnerable to misdecodes by the nature of the symbol, especially when Any Length is
set for Code 128 bar codes. The linear imager offers four levels of decode security for Code 128 bar codes.
There is an inverse relationship between security and linear imager aggressiveness. Increasing the level of
security may result in reduced aggressiveness in scanning, so select only the level of security necessary.
•
Code 128 Security Level 0: This setting allows the linear imager to operate in its most aggressive state,
while providing sufficient security in decoding the most in-spec bar codes.
•
Code 128 Security Level 1: A bar code must be successfully read twice, and satisfy certain safety
requirements before being decoded. This default setting eliminates most misdecodes.
•
Code 128 Security Level 2: Select this option with higher safety requirements to the bar codes if
Security Level 1 fails to eliminate misdecodes.
•
Code 128Security Level 3: If you selected Security Level 2, and misdecodes still occur, select this
security level. The highest safety requirements are applied. A bar code must be successfully read three
times before being decoded.
NOTE Selecting this option is an extreme measure against mis-decoding severely out-of-spec bar codes.
Selecting this level of security significantly impairs the decoding ability of the linear imager. If this level of
security is required, it is recommended that you try to improve the quality of the bar codes.
Code 128Security Level 0
(00h)
*Code 128 Security Level 1
(01h)
Code 128 Security Level 2
(02h)
Code 128 Security Level 3
(03h)
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