Posiflex LS-1000 - Manual (Page 178)

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OMNIDIRECTIONAL SCANNER PROGRAMMING GUIDE
2. Data Redundant Check
In this section, users can use labels to 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.
Code 39 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 39 data redundant check = 1