Motorola FR68 Series User Manual page 137

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 scanner. A type of bar code reader that uses a beam of laser light.
LED Indicator. A semiconductor diode (LED - Light Emitting Diode) used as an indicator, often in
digital displays. The semiconductor uses applied voltage to produce light of a certain frequency
determined by the semiconductor's particular chemical composition.
M
MC. Mobile Computer.
Mobile Computer. In this text, mobile computer refers to the MC75. It can be set up to run as a
stand-alone device, or it can be set up to communicate with a network, using wireless radio
technology.
Q
QWERTY. A standard keyboard commonly used on North American and some European PC
keyboards. "QWERTY" refers to the arrangement of keys on the left side of the third row of keys.
R
RF. Radio Frequency.
ROM. Read-Only Memory. Data stored in ROM cannot be changed or removed.
S
Scanner. An electronic device used to scan bar code symbols and produce a digitized pattern
that corresponds to the bars and spaces of the symbol. Its three main components are: 1) Light
source (laser or photoelectric cell) - illuminates a bar code,; 2) Photodetector - registers the
difference in reflected light (more light reflected from spaces); 3) Signal conditioning circuit -
transforms optical detector output into a digitized bar pattern.
Space. The lighter element of a bar code formed by the background between bars.
Symbol. A scannable unit that encodes data within the conventions of a certain symbology,
usually including start/stop characters, quiet zones, data characters and check characters.
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