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G
LOSSARY
3
Solutions with Vision
Buffer
A temporary storage device used to compensate for a difference in data rate and data flow between two devices (typically M).
Bus
An internal pathway along which electronic signals travel between the components of an electronic device.
Byte
A binary element string functioning as a unit, usually shorter than a computer “word”. Eight-bit bytes are most common. Also
called a “character”.
CART
(Also known as trigger) A signal, typically provided by a photoeye or proximity switch, that informs the scan head of the
presence of an object within its reading zone.
CCD (Charge Coupled Device)
Used in scanners to sense the light and dark areas of a symbol.
CDRH (Center for Devices and Radiological Health)
This organization (a service of the Food and Drug Administration) is responsible for the safety regulations governing acceptable
limitations on electronic radiation from laser devices. Accu-Sort is in compliance with the CDRH regulations.
Capture count
The number of consecutive identical valid decodes that result in a valid read.
Character
A single group of bars and spaces in a code that represent an individual number, letter, punctuation mark or other graphic
element. Used as part of the organization, control, or representation of data.
Character self-checking
The feature which allows a bar code reader to determine if a scanned group of elements is a valid symbol character.
If a symbology is described as character self-checking, a single printed defect (edge error) in any symbol character
does not produce a valid character.
Character set
Those characters available for encodation in a particular automatic identification technology.
Check Character
A character (usually at the end of the code) that is used to perform a mathematical check to ensure the accuracy of a scan of the
bar code.
Code Length
The length of the bar code measured from the start of the first bar to the end of last bar.
Code Orientation
The relationship of the bar code with reference to the scan head’s reading zone. Typical code orientations are Ladder and Picket
Fence.
Code Placement
Variation in code placement affects the ability of a scanner to read a code. The terms Tilt, Pitch, and Skew deal with the angular
variations of code placement in the X, Y and Z axes. Variations in code placement affect the pulse width and therefore the
decoding of the code. Pulse width is defined as a change from the leading edge of a bar or space to the trailing edge of a bar or
space over time. Pulse width is also referred to as a transition. Tilt, pitch, and skew impact the pulse width of the code.
Changes to this code presentation cause the bar codes to appear smaller to the scanner which results in a smaller pulse width.
Each of these variation has a different effect on a scanner reading these codes and the combination of the variations leads to more
complicated effects.
Code Quality
The number of scans successfully decoded during a read cycle.
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