Upc-A Preamble - Symbol LS 9100 Product Reference Manual

Parameters

UPC-A Preamble

Three options are given for lead-in characters for UPC-A
symbols transmitted to the host device: transmit system
character only, transmit system character and country code
("O" for USA), and no preamble transmitted. The lead-in
characters are considered part of the symbol.
NO PREAMBLE
(<DATA>)
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