Posiflex LS-1000 - Manual (Page 149)

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OMNIDIRECTIONAL SCANNER PROGRAMMING GUIDE
EAN/UPC + add on mandatory for 378/379
French Supplement requirement
optionally for other
To prevent confusion in code scanning, cover the
unwanted label and present the desired barcodes one by
one to the scanner.
EAN/UPC + add on mandatory for 978/977
Book land Supplement requirement
optionally for other