Motorola MC909X Integrator Manual page 310

Glossary - 10 MC909X Integrator Guide
R
RAM. Random Access Memory. Data in RAM can be accessed in random order, and quickly written and read.
Reflectance. Amount of light returned from an illuminated surface.
Resolution. The narrowest element dimension which is distinguished by a particular reading device or printed with a
particular device or method.
RF. Radio Frequency.
ROM. Read-Only Memory. Data stored in ROM cannot be changed or removed.
Router. 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.
RS-232. An Electronic Industries Association (EIA) standard that defines the connector, connector pins, and signals used to
transfer data serially from one device to another.
S
Scan Area. Area intended to contain a symbol.
Scanner. 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.
Scanning Mode. The scanner is energized, programmed and ready to read a bar code.
Scanning Sequence. A method of programming or configuring parameters for a bar code reading system by scanning bar
code menus.
SDK. Software Development Kit
Secure Sockets Layer (SSL). SSL is a commonly-used protocol for managing the security of a message transmission on
the Internet. SSL uses a program layer located between the Internet's Hypertext Transfer Protocol (HTTP) and Transport
Control Protocol (TCP) layers. SSL is included as part of both the Microsoft and Netscape browsers and most Web
server products. Developed by Netscape, SSL also gained the support of Microsoft and other Internet client/server
developers as well and became the de facto standard until evolving into Transport Layer Security. The "sockets" part of
the term refers to the sockets method of passing data back and forth between a client and a server program in a network
or between program layers in the same computer. SSL uses the public-and-private key encryption system from RSA,
which also includes the use of a digital certificate.
Self-Checking Code. A symbology that uses a checking algorithm to detect encoding errors within the characters of a bar
code symbol.
Shared Key. Shared Key authentication is an algorithm where both the AP and the MU share an authentication key.