Xerox 4215 Reference Manual page 98

FUNCTION SELECTION VIA LINE (FSL) COMMANDS
UPC and EAN (X2)
Remember The bar code definition must be sent BEFORE the W—Bar
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Code Printout command is used.
Many bar codes include checkdigits.
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Text under the bar code is printed with the resident font.
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As soon as the bar code is defined, it can be activated.
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Start, stop, and center codes are generated automatically.
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Bar code types (second digit) explained
If 7 characters are received, an EAN8 checkdigit is calculated
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and generated.
If 8 characters are received, an EAN8 checkdigit is calculated
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and compared to the 8th digit.
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