Code CR1021 Specifications download pdf (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.

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