
5-3
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 r epr esenting 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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