Q-5
Appendices
MicroHAWK V320-F / V330-F / V420-F / V430-F Barcode Reader User Manual
Q
Parity — An error detection routine in which one data bit in each character is set to 1 or 0 so that the
total number of 1 bits in the data field is even or odd.
Picket Fence Orientation — A linear symbol orientation in which the bars are perpendicular to the
symbol’s direction of travel.
Pitch — Rotation of a linear or 2D symbol around an axis parallel to the symbol length on the Substrate.
Pixel — An individual element in a digitized image array; “picture element”.
Port — Logical circuit for data entry and exit. (One or more ports may be included within a single
connector.)
Processing Time — The time used by a vision system to receive, analyze and interpret image
information. Often expressed in “parts per minute”.
Programmable Logic Controller (PLC)
— An electronic device used in industrial automation
environments such as factory assembly lines and automotive manufacturing facilities.
Progressive Scan — A non-interlaced scan that doubles the number of visible picture lines per field by
displaying all picture lines at once.
Protocol — The rules for communication between devices, providing a means to control the orderly
flow of information between linked devices.
Random Access Memory (RAM) — A data storage system used in computers, composed of integrated
circuits that allow access to stored data in any sequence without movement of physical parts.
Read Cycle — A programmed period of time or condition during which a reader will accept symbol input.
Read-Only Memory (ROM) — A data storage medium used in computers and other electronics,
primarily used to distribute Firmware.
Real-Time Processing — In machine vision, the ability of a system to perform a complete analysis and
take action on one part before the next one arrives for inspection.
Region — Area of an image. Also called a region of interest for image processing operations.
Saturation — The degree to which a color is free of white. One of the three properties of color
perception, along with hue and value.
Scattering — Redirection of light reflecting off a surface or through an object.
Skew — Rotation of a linear or 2D symbol around an axis parallel to the symbol height on the
substrate.
Substrate — The surface upon which a linear or 2D symbol is printed, stamped, or etched.
Symbol Transitions — The transition of bars and spaces on a symbol, used to detect the presence of
a symbol on an object.
Symbology — A symbol type, such as Code 39 or Code 128, with special rules to define the widths
and positions of bars and spaces to represent specific numeric or alphanumeric information.
Tilt — Rotation of a linear or 2D symbol around an axis perpendicular to the substrate.
Trigger — A signal, transition, or character string that initiates a read cycle.
Very Large-Scale Integration (VLSI)
— The creation of integrated circuits by combining thousands
of
transistor-based circuits on a single chip.
Watchdog Timer — A security device that detects system crashes and attempts to reset the imager.
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