GLOSSARY
USER’S MANUAL
115
Symbology
The structural rules and conventions for representing data within a particular bar code
type (e.g. UPC/EAN, Code 39, PDF417, etc.).
USB
Universal Serial Bus. Type of serial bus that allows peripheral devices (disks, modems,
printers, digitizers, data gloves, etc.) to be easily connected to a computer. A "plug-and-
play" interface, it allows a device to be added without an adapter card and without
rebooting the computer (the latter is known as hot-plugging).
Visible Laser Diode (VLD)
A solid state device which produces visible laser light.
WLAN
A Wireless Local Area Network links devices via a wireless distribution method (typically
spread-spectrum or OFDM radio), and usually provides a connection through an access
point to the wider internet. This gives users the mobility to move around within a local
coverage area and still be connected to the network.
WPAN
A Wireless Personal Area Network is a personal area network - a network for intercon-
necting devices centered around an individual person's workspace - in which the con-
nections are wireless. Typically, a wireless pers
onal area network uses some technology
that permits communication within about 10 meters - in other words, a very short
range.
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