Rockwell Automation 2755-G6-D Scanner with RS-232 Option - Manual (Page 97)

Glossary
G–2
check digit: A digit included within a symbol whose
value is based mathematically on other characters
included in the symbol. It is used to mathematically
check the accuracy of a symbol.
clear area: A clear space, containing no dark marks, that
precedes the start character of a symbol and follows the
stop character.
Codabar: A numeric symbology consisting of 16 data
characters and 4 start/stop characters. Codabar is
primarily used by the medical community.
Code 128: A symbology representing the full 128 ASCII
character set. Numeric data may be represented in a
double density mode where two digits are represented by
one character.
Code 39: An alphanumeric symbology recognized by
most nations, widely used in the manufacturing industry.
code type: See symbology.
decode: The process of translating a bar code into
data characters using a specific set of rules for each
symbology.
decoder: A device used to decode, or make usable, a
digital or analog signal transmitted from a scanning
device. The scanner contains a decoder.
EAN: Acronym for European Article Numbering
system, the international standard bar code for retail
food packages.
element: Dimensionally the narrowest width in a
character, bar or space.
encoded area: The total linear dimension consisting of all
the characters of a code pattern, including start/stop
characters and data.
guard bars: Bars at the ends and center of a UPC and
EAN symbol. They ensure a complete scan of the
bar code.