Specifications

Glossary - 7
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.
Shared Key. Shared Key authentication is an algorithm where both the AP and the MU share an authentication key.
Soft Reset. See Warm Boot.
Specular Reflection. The mirror-like direct reflection of light from a surface, which can cause difficulty decoding a bar
code.
Subnet. A subset of nodes on a network that are serviced by the same router. See Router.
Subnet Mask. A 32-bit number used to separate the network and host sections of an IP address. A custom subnet mask
subdivides an IP network into smaller subsections. The mask is a binary pattern that is matched up with the IP
address to turn part of the host ID address field into a field for subnets. Default is often 255.255.255.0.
Substrate. A foundation material on which a substance or image is placed.
Symbol. A scannable unit that encodes data within the conventions of a certain symbology, usually including start/stop
characters, quiet zones, data characters and check characters.
Symbology. The structural rules and conventions for representing data within a particular bar code type (e.g. UPC/EAN,
Code 39, PDF417, etc.).
T
TCP/IP. (Transmission Control Protocol/Internet Protocol) A communications protocol used to internetwork dissimilar
systems. This standard is the protocol of the Internet and has become the global standard for communications. TCP
provides transport functions, which ensures that the total amount of bytes sent is received correctly at the other end.
UDP is an alternate transport that does not guarantee delivery. It is widely used for real-time voice and video
transmissions where erroneous packets are not retransmitted. IP provides the routing mechanism. TCP/IP is a
routable protocol, which means that all messages contain not only the address of the destination station, but the
address of a destination network. This allows TCP/IP messages to be sent to multiple networks within an
organization or around the world, hence its use in the worldwide Internet. Every client and server in a TCP/IP
network requires an IP address, which is either permanently assigned or dynamically assigned at startup.