QX-830 Compact Industrial Scanner User’s Manual A-85
Appendices
Programmable Logic Controller (PLC)
— An electronic device used in industrial automation
environments such as factory assembly lines and automotive manufacturing facilities.
Protocol — The rules for communication between devices, providing a means to control
the orderly flow of information between linked devices.
Read Cycle — A programmed period of time or condition during which a scanner will accept
symbol input.
Skew — Rotation of a symbol around an axis parallel to the symbol height on the substrate.
See the illustration under the definition of Pitch.
Substrate — The surface upon which a 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 symbol around an axis perpendicular to the substrate. See the illustration
under the definition of Pitch.
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.
VLSI — See Very Large-Scale Integration.
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