Datalogic DX6400 Reference Manual page 81

RS485
Interface that specifies the electrical characteristics of generators and receivers for use in
balanced digital multipoint systems such as on a Multidrop line.
Scanner
A device that examines a printed pattern (barcode) and either passes the uninterpreted data
to a decoder or decodes the data and passes it onto the Host system.
Serial Port
An I/O port used to connect a scanner to your computer, identifiable by a 9-pin or 25-pin
connector.
Signal
An impulse or fluctuating electrical quantity (i.e.: a voltage or current) the variations of which
represent changes in information.
Skew
Rotation about the Y-axis. Rotational deviation from correct horizontal and vertical
orientation; may apply to single character, line or entire encoded item. See pars. 0.
Step-a-Head™
Step-a-Head™ makes it possible to rotate the reader head and the decoder base
independently from each other. As a result of the Step-a-Head™, the DX6400/DX6500 can
always be installed in the ideal position. It is possible to change the orientation of the
connector panel while the laser window remains in the desired position.
Symbol
A combination of characters including start/stop and checksum characters, as required, that
form a complete scannable barcode.
Tilt
Rotation around the Z axis. Used to describe the position of the barcode with respect to the
laser scan line. See pars. 0.
Trigger Signal
A signal, typically provided by a photoelectric sensor or proximity switch, which informs the
scanner of the presence of an object within its reading zone.
UPC
Acronym for Universal Product Code. The standard barcode type for retail food packaging in
the United States.
Visible Laser Diode
A light source used in scanners to illuminate the barcode symbol. Generates visible red light
at wavelengths between 630 and 680 nm.
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