Opticon XPT 3125 Universal menubook - Manual (Page 139)

OPTICON Universal menu book
U132
B. GLOSSARY OF TERMS
AIM:
An acronym for Association for Automatic
Identification and Mobility. This is referring to an
organization that is an authority for standards
for bar codes.
ASCII:
An acronym for American Standard Code for
Information Interchange. This refers to a set of
128 characters that are standardized. These
characters include all basic English characters,
digits, punctuation characters and control
characters.
Bar:
The dark element of a printed symbol.
Bar code:
An array of parallel rectangular bars and
spaces which together represent data elements
of characters in a particular symbology. The
bars and spaces are arranged in a
predetermined pattern, following unambiguous
rules defined by the symbology.
Bar code density:
The number of bar code characters which can
be represented in a linear unit of measure. Bar
code density is often expressed in characters
per inch.
Bar code label:
A label that carries a bar code and, optionally,
other human-readable information; it can be
affixed to an article.
Bar code reader:
A device used to scan and decode a bar code
symbol.
Bar width:
The thickness of a bar measured from the edge
closest to the symbol start character to the
trailing edge of the same bar. Also known as
element width.
Baudrate:
The rate at which data is transferred over a
serial interface, expressed in bits per second.
Bluetooth:
A wireless transmission protocol that uses
radio frequency waves. More information on
bluetooth can be found on the Internet site:
http://www.bluetooth.org
Bluetooth dongle:
A device that converts electrical signals into
radio frequency waves according to the
bluetooth standard.
CCD reader:
A scanning device which uses the CCD
technology. CCD is an acronym for Charge
Coupled Device. Light from a lightsource within
the CCD reader is reflected by a bar code label
and falls on an array of light sensitive elements
in the reader, the CCD. Whether the light is
reflected depends on black or white parts of the
bar code. The presence (or absence) of
reflected light determines the presence (or
absence) of electrical charge (electrons) in the
distinct elements. The result is an electrical
image of the bar code which can be used for
further processing.
Character:
A single group of bars and spaces which
represent an individual number, letter or
punctuation mark. It is usually composed of six,
seven or eight bits.
Check digit:
A character included within a symbol whose
value is based, mathematically, on other
characters within the symbol. It is used to
perform a mathematical check to ensure the
accuracy of the read.
CMOS interface:
A serial interface that typically is used between
embedded devices. The CMOS standard
defines a logical "1" level at the same level as
the power supply of the electronic components
that are used inside the device.