Posiflex LS-1000 - Manual (Page 195)

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OMNIDIRECTIONAL SCANNER PROGRAMMING GUIDE
5. Data Redundant Check
In this section, users can set decoder data redundant check before
it is accepted as a good read. A higher data redundant check read
setting offers more assurance that a bar code has been read
correctly while a lower setting allows faster scanning performance
Code 128 data redundant check = 0
To prevent confusion in code scanning, cover the
unwanted label and present the desired barcodes one by
one to the scanner.
Code 128 data redundant check = 1