Glossary - 9
Scanner. An electronic device used to scan bar code symbols and produce a digitized pattern that co rresponds 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 pro gramming or configurin g parameters for a bar code reading system by scanning
bar code menus.
SDK. Software Development Kit
Self-Checking Code. A symbology that uses a checking algorithm to detect encoding errors within th e 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.
SHIP. Symbol Host Interface Program.
SID. System Identification code. An identifier issued by the FCC for each market. It is also broadcast by the cellular
carriers to allow cellular dev ice s to dist ing u i sh between the home an d ro am in g se rvic e.
SMDK. Symbol Mobility Developer’s Kit.
Soft Reset. See Warm Boot.
Space. The lighter element of a bar code formed by the background between bars.
Specular Reflection. The mirror-like direct r eflection of light from a surface, which can cause difficulty decoding a bar
code.
Start/Stop Character. A pattern of bars and spaces that provides the scanner with start and stop read ing instructions
and scanning direction. The start and stop characters are no rmally to the left and rig ht margins of a horizontal code.
STEP. Symbol Terminal Enabler Program.
Subnet. A subset of nodes on a network that are service d 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 foundatio n material on which a substance or image is placed.
SVTP. Symbol Virtual Terminal Program.
Symbol. A scannable unit tha t encodes data within the conventions of a certain symbology, usually including start/stop
characters, quiet zones, data characters and check characters.
Symbol Aspect Ratio. The ratio of symbol height to symbol width.
Symbol Height. The distance between the outside edge s of the quiet zones of the first row and the last row.