15 Glossary
A
AIM
(Association for Automatic Identification and
Mobility): AIM Global is the international trade
association representing automatic identification and
mobility technology solution providers.
AIM DPM Quality Guideline
Standard applicable to the symbol quality
assessment of direct part marking (DPM) performed
in using two-dimensional barcode symbols. It defines
modifications to the measurement and grading of
several symbol quality parameters.
B
Barcodes (1D Codes)
A pattern of variable-width bars and spaces which
represents numeric or alphanumeric data in machine-
readable form. The general format of a barcode
symbol consists of a leading margin, start character,
data or message character, check character (if any),
stop character, and trailing margin. Within this
framework, each recognizable symbology uses its
own unique format.
BIOS
Basic Input Output System. A collection of ROM-
based code with a standard API used to interface
with standard PC hardware.
Bit
Binary digit. One bit is the basic unit of binary
information. Generally, eight consecutive bits
compose one byte of data. The pattern of 0 and 1
values within the byte determines its meaning.
Bits per Second (bps)
Number of bits transmitted or received per second.
Bright Field Illumination
Lighting of surfaces at high (narrow) angles used to
provide maximum reflection of the light to the
reader’s lens. This is effective on surfaces that
absorb light or are not highly reflective and also on
low contrast codes.
Byte
On an addressable boundary, eight adjacent binary
digits (0 and 1) combined in a pattern to represent a
specific character or numeric value. Bits are
numbered from the right, 0 through 7, with bit 0 the
low-order bit. One byte in memory can be used to
store one ASCII character.
C
Composite Symbologies
Consist of a linear component, which encodes the
item's primary data, and an adjacent 2D composite
component, which encodes supplementary data to
the linear component.
D
Dark Field Illumination
Lighting of surfaces at wide angles used to avoid
direct reflection of the light into the reader’s lens.
Typically this type of lighting is used in DPM
solutions to enhance reflectance of the uneven
surface do to the symbol marking technique. It is also
used with very reflective surfaces.
Decode
To recognize a barcode symbology (for example,
Codabar, Code 128, Code 3 of 9, UPC/EAN, etc.)
and analyze the content of the barcode scanned.
Depth of Field
The difference between the minimum and the
maximum distance of the object in the field of view
that appears to be in focus.
Diffused Illumination
Distributed soft lighting from a wide variety of angles
used to eliminate shadows and direct reflection
effects from highly reflective surfaces.
Direct Part Mark (DPM)
A symbol marked on an object using specific
techniques like dot peening, laser etching, chemical
etching, etc.
ABR 3000 Series Barcode Reader
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