Symbol MC50 User Manual page 185

Print Contrast Signal (PCS)
Programming Mode
Quiet Zone
QWERTY
RAM
Reflectance
Resolution
RF
ROM
ROM-DOS
Router
RS-232
Scan Area
Scanner
Scanning Mode
Scanning Sequence
SDK
Measurement of the contrast (brightness difference)
between the bars and spaces of a symbol. A minimum PCS
value is needed for a bar code symbol to be scannable. PCS
= (RL - RD) / RL, where RL is the reflectance factor of the
background and RD the reflectance factor of the dark bars.
The state in which a scanner is configured for parameter
values. See Scanning Mode.
A clear space, containing no dark marks, which precedes
the start character of a bar code symbol and follows the
stop character.
A standard keyboard commonly used on North American
and some European PC keyboards. "QWERTY" refers to the
arrangement of keys on the left side of the third row of
keys.
Random Access Memory. Data in RAM can be accessed in
random order, and quickly written and read.
Amount of light returned from an illuminated surface.
The narrowest element dimension which is distinguished
by a particular reading device or printed with a particular
device or method.
Radio Frequency.
Read-Only Memory. Data stored in ROM cannot be changed
or removed.
The name of the licensed Disk Operating System loaded
into the terminal's flash file system.
A device that connects networks and supports the required
protocols for packet filtering. Routers are typically used to
extend the range of cabling and to organize the topology of
a network into subnets. See Subnet.
An Electronic Industries Association (EIA) standard that
defines the connector, connector pins, and signals used to
transfer data serially from one device to another.
Area intended to contain a symbol.
An electronic device used to scan bar code symbols and
produce a digitized pattern that corresponds to the bars and
spaces of the symbol. Its three main components are:
1. Light source (laser or photoelectric cell) - illuminates a
bar code.
2. Photodetector - registers the difference in reflected light
(more light reflected from spaces).
3. Signal conditioning circuit - transforms optical detector
output into a digitized bar pattern.
The scanner is energized, programmed and ready to read a
bar code.
A method of programming or configuring parameters for a
bar code reading system by scanning bar code menus.
Software Development Kit
Glossary GL-11