Intermec Trakker Antares 2420, User Manual

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TRAKKER Antares 2420 and 2425 Hand-Held Terminal User’s Manual
G-14
laser scanner
An optical bar code reading device that uses a low energy laser light beam to examine a
spatial pattern, one part after another. It then generates analog or digital signals
corresponding to the pattern. Laser scanners are often used in mark sensing, pattern
recognition, character recognition, and bar code recognition. The laser scanner converts
bar code symbols to electrical signals for input to a bar code reader decoder for
processing and subsequent output through a data communications interface.
LCD
Liquid crystal display. A display comprised of groups of transparent anisotropic liquid
segments that are switched between two transparent electrodes. Application of an electric
field across a segment changes the reflectivity of the liquid and it becomes opaque.
LED
Light emitting diode. A semiconductor that produces light at a wavelength determined by
its chemical composition. LEDs are often used as the light source in bar code readers and
terminals.
level triggering
A scanner trigger configuration that makes the laser turn on after you activate the scanner
and stay on until you release the Scan button or the trigger on a cabled scanner. Contrast
with “edge triggering.”
lithium-ion battery pack
Provides the main power source to operate the terminal. The lithium-ion battery pack is
rechargeable and charges the backup battery when required.
local editing error
An error that occurs when a user performs an operation in a field that is not supported by
the field’s properties or definition. No data is sent when a local editing error occurs. For
example, a local editing error occurs when a user enters characters in a numeric-only
field.
logical partition
A logically distinct portion of memory or a storage device that functions as though it
were a physically separate unit.
LRC
Longitudinal Redundancy Check character. This character is an error-checking character
that is optionally appended to transmitted blocks of data and optionally checked on
received blocks of data.