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7
V550-A20 Operation Manual
Glossary
7
Space
- The lighter elements of a bar code symbol formed by the
background between bars.
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.
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 scan-
nable 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 charac-
ters 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 arrange-
ment, at one end, and a different stop character bar and space
arrangement at the other end, provide for bidirectional decoding
of this symbol.
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. The other method uses a heated bar and
the paper moves across the bar. Another type of thermal printer is
called a Thermal Transfer printer. The main difference between
this type of printer and a thermal printer is the use of heat
sensitive ribbons as opposed to heat sensitive paper. This type of
printing is permanent on label stock.
Common Problems with
thermal printing:
Since the paper used is heat activated the
labels will deteriorate over time in a warm environment. Infrared
scanners cannot detect the bar codes and consequently a visible
red light laser must be used to scan these codes.
Benefits of
thermal printing:
Thermal printers are quiet and inexpensive.
Thermal Transfer
- A printing system like thermal except a one-
time ribbon is used and common paper is used as a substrate.
Eliminates the problems of fading or changing color inherent in
thermal printing.
Tilt -
Rotation around the Z axis. Used to describe the position of
the bar code with respect to the laser scan line.
Trigger
- A signal, typically provided by a photoelectric or
proximity sensor, that informs the bar code reader of the presence
of an object within its reading zone.
UCC
(Uniform Code Council) - The organization that administers
the UPC and other retail standards.
Undersquare
- Used to describe bar codes that are longer (from
the first to last bar) than they are high (from the top to bottom of
the bars).
Vane
Raster
- Decreases the amount of scans possible due to a
smaller percentage of scans bisecting the code.
Verifier
- A device that makes measurements of the bars, spaces,
quiet zones and optical characteristics of a symbol to determine if
the symbol meets the requirements of a specification or standard.
Vibrating Vane
- A variable raster that can have an unlimited
number of raster lines. It covers a larger area and is adjustable.
Wand Scanner -
A hand-held contact laser scanner that an
operator guides across the bar code.
Wedge
- A device that plugs in between a keyboard and a
terminal. It allows data to be entered either by keyboard or by
various types of scanners.
Wide Bar (WB)/Wide Space (WS) -
Widest code element, bar or
space, in the bar code symbol.
Wide to Narrow Ratio
- Dividing the size of the wide elements by
the size of the narrow elements of a bar code
yields the bar and
space ratios. Bar and space ratios can differ.
NOTE:
If the narrow
bar and narrow space are equal and the wide bar and wide space
are equal, then you calculate only one ratio.
"X" Dimension
- The dimension of the narrowest bar and
narrowest space in a bar code.
XON
- A control character sent by the receiving device to signal
the transmitting device to begin sending data.
XOFF
- A control character sent by the receiving device to signal
the transmitting device to stop sending data.
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