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Glossary
IEC CLASS I (IEC 825 Class I) - This is the lowest power IEC laser
classification. Conformity is ensured through a software restriction of 25
seconds of laser operation within any 100 second window and an automatic
laser shutdown if the scanner's oscillating mirror fails.
INTERCHARACTER GAP - The space between two adjacent bar code
characters in a discrete bar code.
INTERLEAVED BAR CODE - A bar code in which characters are paired
together, using bars to represents the first character and the intervening spaces
to represent the second.
INTERLEAVED 2 OF 5 - A binary bar code symbology representing character
pairs in groups of five bars and five interleaved spaces. Interleaving provides
for greater information density. The location of wide elements (bar/spaces)
within each group determines which characters are encoded. This
continuous code type uses no intercharacter spaces. Only numeric (0 to 9)
and START/STOP characters may be encoded.
LASER - An acronym for Light Amplification by Stimulated Emission of
Radiation. The laser is an intense light source. Light from a laser is all the same
frequency, unlike the output of an incandescent bulb. Laser light is typically
coherent and has a high energy density.
LASER DIODE - A semiconductor type of laser connected to a power source
to generate a laser beam. This laser type is a compact source of coherent light.
PARAMETER - A variable that can have different values assigned to it.
PROGRAMMING MODE - The state in which a scanner is configured for
parameter values. See SCANNING MODE.
QUIET ZONE - A clear space, containing no dark marks, which precedes the
start character of a bar code symbol and follows the stop character.
REDUNDANCY - A decoding method which requires a bar code be
recognized redundantly on a number of sweeps of the scan beam before a
decode is declared. While slowing the time-to-decode, redundancy can help
lower the possibility of a mis-decode of poorly printed symbols.
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