Intermec EasyCoder 3400e User Manual page 118

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Glossary
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UPC
Universal Product Code. A numeric, 12-digit bar code symbology used
extensively in retail, particularly the grocery industry.
User-Defined Characters (UDC)
See graphic.
User-Defined Fonts (UDF)
See soft font.
variable data field
Bar code and text fields that change from one label to the next.
XON/XOFF protocol
A protocol that stops the host from sending data when the printer buffer
fills up and starts it again when the buffer empties.
EasyCoder 3400e Bar Code Label Printer User's Manual