Glossary GL-3
Character A pattern of bars and spaces which either directly represents data
or indicates a control function, such as a number, letter, punctuation
mark, or communications control contained in a message.
Character Set Those characters available for encoding in a particular bar code
symbology.
Check Digit A digit used to verify a correct symbol decode. The scanner inserts
the decoded data into an arithmetic formula and checks that the
resulting number matches the encoded check digit. Check digits are
required for UPC but are optional for other symbologies. Using
check digits decreases the chance of substitution errors when a
symbol is decoded.
Codabar A discrete self-checking code with a character set consisting of
digits 0 to 9 and six additional characters: ( - $ : / , +).
Code 128 A high density symbology which allows the controller to encode all
128 ASCII characters without adding extra symbol elements.
Code 3 of 9 (Code 39) A versatile and widely used alphanumeric bar code symbology with
a set of 43 character types, including all uppercase letters,
numerals from 0 to 9 and 7 special characters (- . / + % $ and space).
The code name is derived from the fact that 3 of 9 elements
representing a character are wide, while the remaining 6 are
narrow.
Code 93 An industrial symbology compatible with Code 39 but offering a full
character ASCII set and a higher coding density than Code 39.
Code Length Number of data characters in a bar code between the start and stop
characters, not including those characters.
Cold Boot A cold boot restarts the mobile computer and erases all user stored
records and entries.
COM port Communication port; ports are identified by number, e.g., COM1,
COM2.
Continuous Code A bar code or symbol in which all spaces within the symbol are
parts of characters. There are no intercharacter gaps in a
continuous code. The absence of gaps allows for greater
information density.
Cradle A cradle is used for charging the mobile computer battery and for
communicating with a host computer, and provides a storage place
for the mobile computer when not in use.
Data Communications Equipment (DCE) A device (such as a modem) which is designed to attach directly to
a DTE (Data Terminal Equipment) device.
DCE See Data Communications Equipment.
DCP See Device Configuration Package.
Dead Zone An area within a scanner's field of view, in which specular
reflection may prevent a successful decode.
Decode To recognize a bar code symbology (e.g., UPC/EAN) and then
analyze the content of the specific bar code scanned.
Decode Algorithm A decoding scheme that converts pulse widths into data
representation of the letters or numbers encoded within a bar code
symbol.
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