Symbol SE 923, Integration Manual

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Glossary-4
SE-923 Scan Engine Integration Guide
Encoded Area Total linear dimension occupied by all characters of a code pattern,
including start/stop characters and data.
Host Computer A computer that serves other terminals in a network, providing such
services as computation, database access, supervisory programs, and
network control.
IEC International Electrotechnical Commission. This international agency
regulates laser safety by specifying various laser operation classes based
on power output during operation.
IEC (825) Class 1 This is the lowest power IEC laser classification. IEC Class I devices
are safe under reasonably foreseeable conditions of operation.
Software and other controls to limit exposure to laser light may be
required to achieve IEC Class 1 operation. The IEC time base for Class
1 devices is 100 seconds if intentional viewing of laser light is not
required in the design or function of the device. The IEC time base for
Class 1 devices is 30,000 seconds where intentional viewing of laser
light is inherent in the design or function of the device.
IEC (825) Class 2 IEC Class 2 devices may not emit more than 1 milliwatt average radiant
power. For this scan engine, additional software controls are not
necessary. Eye protection for IEC Class 2 devices is normally afforded
by aversion responses, including the blink reflex.
Intercharacter Gap The space between two adjacent bar code characters in a discrete code.
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.
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 - 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.