Symbol MK2000 MicroKiosk, Product Reference Manual

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Glossary-3
Glossary
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.
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.
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.
Decryption Decryption is the decoding and unscrambling of received encrypted
data. Also see, Encryption and Key.
Depth of Field The range between minimum and maximum distances at which a
scanner can read a symbol with a certain minimum element width.