Symbol DS 3478 Product Reference Manual page 396

GL-8 DS 3478 Product Reference Guide
Module
Module Check Digit or Character
Moving Beam Bar Code Reader
MRD
MSI
Nanometer
Nominal
Nominal Size
Non-Contact Reader/Scanner
Non-read
Omnidirectional
Optical Throw
Orientation
Overhead
Parameter
(1) The narrowest nominal width unit of measure in a
symbol. In certain symbologies, element widths are
specified as multiples of 1 module. Equivalent to X
dimension; or (2) a single cell in a matrix symbology used to
encode 1 bit of data. In MaxiCode, the module shape is a
regular hexagon. In Data Matrix, the module shape is
nominally square. In PDF417, the module shape is a regular
rectangle. In bar code symbologies, the module shape is a
regular rectangle.
A character within the symbol data field calculated using
modular arithmetic that is used for error detection. The
calculated character is determined by applying a code
algorithm to the data field contents (see
A device where scanning motion is achieved by
mechanically moving the optical geometry.
Minimum reflectance difference: a formula that is used to
determine if there is an adequate difference between
absorbed and reflected light.
Based on the original Plessey Code, MSI, also known as
Modified Plessey, is a continuous, non-self-checking
symbology used to mark retail shelves for inventory control.
Unit of measure used to define the wavelength of light that
is equal to 10-9 meter.
The exact (or ideal) intended value for a specified
parameter. Tolerances are specified as positive and
negative deviations from this value.
Standard size for a bar code symbol. Most UPC/EAN codes
are used over a range of magnifications (e.g., from 0.80 to
2.00 of nominal).
Bar code readers requiring no physical contact with the
printed symbol.
The absence of data at the scanner output after an
attempted scan, which is due to no code, defective code,
scanner failure or operator error.
Bar codes read in any orientation relative to the scanner.
The distance from the scanner face to the closest point at
which symbol can be read; also, optical throw is the
difference between range and depth of field.
The alignment of the symbol's scan path. Two possible
orientations are horizontal with vertical bars and spaces
(picket fence) and vertical with horizontal bars and spaces
(ladder).
The fixed number of characters required for start, stop and
checking in a given symbol. For example, a symbol requiring
a start, stop and 2 check characters contains 4 characters
of overhead.
A variable that can have different values assigned to it.
Check Digit).