Datalogic Matrix 120, Product Reference Manual

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GLOSSARY
168 MATRIX 120™
Byte
On an addressable boundary, eight adjacent binary digits (0 and 1) combined in a pat-
tern 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.
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.
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 reflec-
tance of the uneven surface do to the symbol marking technique. It is also used with
very reflective surfaces.
Decode
To recognize a barcode symbology (e.g., 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.
EEPROM
Electrically Erasable Programmable Read-Only Memory. An on-board non-volatile mem-
ory chip.
Element
The basic unit of data encoding in a 1D or 2D symbol. A single bar, space, cell, dot.
Exposure Time
For digital cameras based on image sensors equipped with an electronic shutter, it
defines the time during which the image will be exposed to the sensor to be acquired.