Posiflex LS-1000 - Manual (Page 155)

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OMNIDIRECTIONAL SCANNER PROGRAMMING GUIDE
13. Data Redundant Check
In this section, user 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 barcode has been read
correctly, while a lower setting allows faster scanning performance.
UPC-A Data Redundant Check
UPC-A 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.
UPC-A data redundant check = 1