G
LOSSARY
15
Solutions with Vision
Specular Reflections
A condition when the laser light is reflected back from the code’s surface at an angle equal, or nearly equal, to the angle of
incidence of the laser light. This condition makes it difficult for the scan head to detect the differences in light variation caused
by the code’s bars and spaces.
Spot
The undesirable presence of an area of low reflectance in a space.
start and stop characters
Stacked Codes
16K and Code 49 are examples where a long symbol is broken into sections and "stacked" one upon another similar to sentences
in a paragraph. Extremely compact codes.
Start Bit
In asynchronous transmission, the first bit or element in each character, normally a space, that prepares the receiving equipment
for the reception and registration of the character.
Stop Bit
The last bit in an asynchronous transmission, used to indicate the end of a character, normally a mark condition, that serves to
return the line to its idle or rest state.
STX (Start of Text)
A transmission control character that precedes a text and is used to terminate a heading. (^B)
Symbol
A combination of characters including start/stop and checksum characters, as required, that form a complete scannable bar code.
Symbologies
Code 39
A bar code with a full alphanumeric character set, a unique start and stop character, and three other characters. The name is
derived from its code structure, which is 3 wide elements out of a total of 9 elements. The nine elements consist of five bars and
four spaces.
Code 128
A bar code symbology capable of encoding the full ASCII 128 character set. It encodes these characters using fewer code
elements per character resulting in a more compact code. It features a unique start and stop character for bidirectional and
variable length decoding, both bar and space character parity for character integrity, a check character for symbol integrity, a
function character for symbol linking, and spare function characters for unique application definition and/or future expansion.
Interleaved 2 of 5 (I 2of5)
A bar code with a numeric character set with different start and stop characters. The name is derived from the method used to
encode two characters. In the symbol, two characters are paired together using bars to represent the first character and the spaces
to represent the second. This interleaved structure allows information to be encoded in both the bars and the spaces. A start
character, bar and space arrangement, at one end, and a different stop character bar and space arrangement at the other end,
provide for bidirectional decoding of this symbol.
Syntax
The rules dictating how you must type a command or instruction so the computer will understand it.
System.ini file
When you start Windows, it consults the system.ini file to determine a variety of options for the Windows operating environment.
Among other things, the system.ini file records which video, mouse, and keyboard drivers are installed for Windows. Running
the Control Panel or Windows Setup program may change options in the system.ini file.
Tag
A collection of information associated with a single variable or I/O point.
Two-width symbology
A bar code symbology whose bar and spaces are characterized simply as wide or narrow. Codabar, Code 39, and
Interleaved 2 of 5 are examples of two-width symbologies.
Terminal Program
Computer software that sends, receives, and displays serial data.
Thermal Printing
Thermal printers use heated print heads and special heat activated paper. There are two types of thermal printers. One uses a
method similar to the dot matrix printer where an array of heated dots move along the paper and form the character or bar code.
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