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Full Duplex
Simultaneous, two-way, independent transmission in both directions.
Half Duplex
Transmission in either direction, but not simultaneously.
Host
A computer that serves other terminals in a network, providing services such as network
control, database access, special programs, supervisory programs, or programming
languages.
Interface
A shared boundary defined by common physical interconnection characteristics, signal
characteristics and meanings of interchanged signals.
LED (Light Emitting Diode)
A low power electronic device that can serve as a visible or near infrared light source when
voltage is applied continuously or in pulses. It is commonly used as an indicator light and
uses less power than an incandescent light bulb but more than a Liquid Crystal Display
(LCD). LEDs have extremely long lifetimes when properly operated.
Multidrop Line
A single communications circuit that interconnects many stations, each of which contains
terminal devices. See RS485.
Parameter
A value that you specify to a program. Typically parameters are set to configure a device to
have particular operating characteristics.
Picket-Fence Orientation
When the barcode’s bars are positioned vertically on the product, causing them to appear as
a picket fence. The first bar will enter the scan window first. See par. 7.2.2.
Pitch
Rotation of a code pattern about the X-axis. The normal distance between center line or
adjacent characters. See pars. 3.2.1 and 3.3.
Position
The position of a scanner or light source in relation to the target of a receiving element.
Protocol
A formal set of conventions governing the formatting and relative timing of message
exchange between two communicating systems.
Raster
The process of projecting the laser beam at varied angles spaced evenly from each other.
Typically, the mirrored rotor surfaces are angled to create multiple scan lines instead of a
single beam.
Resolution
The narrowest element dimension, which can be distinguished by a particular reading device
or printed with a particular device or method.
