Motorola Symbol MS4404 Integration Manual page 291

CDRH Class 2. CDRH Class II devices may not emit more than 1 milliwatt average radiant power. Eye protection for CDRH
Class II devices is normally afforded by aversion responses, including the blink reflex.
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. A set of unambiguous rules specifying the way in which data may be represented as numbers and letters used to
represent information. See Number System.
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.
Codeword. As a symbol character value, this isan intermediate level of coding between source data and the graphical
encodation in the symbol.
COM port. Communication port; ports are identified by number, e.g., COM1, COM2.
Concatination. The construction of a string of data from two or more strings by appending each string in succession. The
linking or chaining together of separate items of data in a bar code symbol or of the data contained in two or more
separate bar code symbols (also referred to as message append and structured append).
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.
Contrast. The difference in reflectance between the black and white (or bar and space) areas of a symbol.
D
Data Identifier. A specified character or string of characters that defines the intended use of the data element that follows.
For the purposes of automatic data capture technologies, data identifier refers to the alphanumeric identifiers as defined
in ANSI MH10.8.2, formerly known as ANSI/FACT data identifiers.
Glossary - 3