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UPC-A Preamble
Preamble characters are part of the UPC bar code consisting of Country Code and Sys-
tem Character. Three options are given for transmitting UPC-A preamble to the host de-
vice: transmit System Character only, transmit System Character and Country Code (“0”
for USA), and no preamble transmitted. Scan a bar code below to match the host system.
No Preamble
(<DATA>)
*System Character
(<SYSTEM CHARACTER> <DATA>)
System Character & Country Code
(< COUNTRY CODE> <SYSTEM CHARACTER> <DA-
TA>)