Rockwell Automation 2755-L7, -L9 Scanners - Manual (Page 44)

Glossary
G–6
misread
A condition which occurs when the data output of a reader does not agree
with the encoded data presented. See substitution error.
module
A group of elements.The term module is used by the Uniform Product Code Council
in it descriptions of the UPC code. A module is the narrowest unit of measure in the
code. A module may be “black” or “white”. Contiguous modules are used to form
bars or spaces that are wider than one unit.
modulo check digit or character
A calculated character within a data field used for error detection. The
calculated character is determined by applying a code algorithm to the data
field contents.
modulus 43 check character
Used in Code 39 for data security in addition to the built–in self–checking
characters. The check–character is the modulus 43 sum of all of the
character values in a given message and is the last character in the code
moving beam scanner
A device which dynamically searches for a bar code pattern by sweeping a
moving optical beam through a field of view.
N
nanometer
Unit of measure used to define the wavelength of light. 10 9 meters.
no–read, non–read, non–scan
The absence of data at the scanner output after an attempted scan due to no
code, defective code, scanner failure or operator error.
nominal size
The standard size for a bar code symbol. Most codes can be used over a range of
magnifications from 0.80 to 1.20, nominal.
numeric
A machine vocabulary that includes only the numbers as contrasted to
alphanumeric which includes both letters and numerals.
O
OCR
Acronym for Optical Character Reader. An information processing device
that scans and decodes human readable OCR symbols.
OCR–A
An abbreviation commonly applied to the character set contained in ANSI
Standard x3.17–1974.