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Glossary - 4
Symbol PL4507 Decoder Integration Guide
H
Hz. Hertz; A unit of frequency equal to one cycle per second.
I
IEC. International Electrotechnical Commission. This international agency regulates laser safety by specifying various laser
operation classes based on power output during operation.
Intercharacter Gap. The space between two adjacent bar code characters in a discrete code.
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.
Interleaved Bar Code. A bar code in which characters are paired together, using bars to represent the first character and
the intervening spaces to represent the second.
I/O Ports. interface The connection between two devices, defined by common physical characteristics, signal
characteristics, and signal meanings. Types of interfaces include RS-232 and PCMCIA.
K
Key. A key is the specific code used by the algorithm to encrypt or decrypt the data. Also see, Encryption and Decrypting.
L
LASER. 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 gallium-arsenide semiconductor type of laser connected to a power source to generate a laser beam. This
laser type is a compact source of coherent light.
LED Indicator. A semiconductor diode (LED - Light Emitting Diode). The semiconductor uses applied voltage to produce
light of a certain frequency determined by the semiconductor's particular chemical composition.
Light Emitting Diode. See LED.
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