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Quick Check® 600/800 Series User’s Guide
Symbology Characteristics
Your Quick Check 600/800 Verifier can handle bar code symbologies with a
variety of characteristics. To help understand symbologies, you should be
familiar with the following commonly used terms:
•
Code
refers to the actual data contained in the bar code symbol, such as a
part number, serial number, transaction code or other type of data.
•
Symbol
refers to the actual arrangement of parallel bars and spaces that
encode the data.
•
The
character
set
describes the range of data characters that can be
encoded in a given symbol. For example, UPC uses only
numbers and is called a numeric symbology, whereas Code 39 uses
alphabetical characters, numbers and special characters.
•
There are two
symbology types
, discrete and continuous.
•
In a
discrete
code, each character stands alone and can be decoded.
Between characters is a loosely toleranced intercharacter gap which
contains no information. Every discrete character has a bar on each
end. One example of a discrete code is Code 39.
•
In a
continuous
code, there are no intercharacter gaps. Every
character begins with a bar and ends with a space. The end of one
character is indicated by the start of the next
character. An example of a continuous code is UPC.
•
The
bar and space widths
can vary within or between symbologies;
those with only two-element widths (wide and narrow) versus those
that use multiple widths.
•
Two-width symbologies
, such as Code 39, have a ratio of wide to
narrow typically between two and three.
•
Multiple-width symbologies
, such as UPC, allow the bars and
spaces to assume more than two different widths. Most multiple-width
symbologies have characters whose length is subdivided into a
predetermined number of modules. In addition, the width of each bar
or space is always an integral number of modules.
Bar code symbologies vary on the amount of information that can be encoded in
a given length. Usually, only characters have a specified
density
, since the
overall length of a symbol must include other characters. These other characters
may include a start/stop code and a check character.
•
A
start
code is a pattern of bars and spaces that appears at the beginning of
a symbol to inform the reading tool where the symbol begins.
•
A
stop
code is a pattern placed at the end of a symbol for marking the end of
the data characters. Sometimes the start and/or the stop characters also
indicate the scanning direction.
Quiet zones
are areas at the beginning and end of a bar code symbol that allow
the optical equipment to differentiate a bar code from other printed material.
Most of the symbologies in use today are
bidirectional
; this means that they can
be read by a scanner either left-to-right or right-to-left without affecting the
decoded data.
Summary of Contents for Quick Check 600 Series
Page 1: ... User s Guide Quick Check 600 800 Series Bar Code Verifiers ...
Page 22: ...1 16 Quick Check 600 800 Series User s Guide ...
Page 44: ...3 20 Quick Check 600 800 Series User s Guide ...
Page 47: ...Quick Check 600 800 Series User s Guide 4 3 Determining the ISO IEC Symbol Grade ...
Page 48: ...4 4 Quick Check 600 800 Series User s Guide Determining the ISO IEC Symbol Grade continued ...
Page 74: ...5 12 Quick Check 600 800 Series User s Guide ...
Page 88: ...7 6 Quick Check 600 800 Series User s Guide ...
Page 103: ...Quick Check 600 800 Series User s Guide 10 1 10 Flow Charts ...
Page 104: ...10 2 Quick Check 600 800 Series User s Guide ...
Page 105: ...Quick Check 600 800 Series User s Guide 10 3 ...
Page 106: ...10 4 Quick Check 600 800 Series User s Guide ...
Page 107: ...Quick Check 600 800 Series User s Guide 10 5 ...
Page 108: ...10 6 Quick Check 600 800 Series User s Guide ...
Page 109: ...Quick Check 600 800 Series User s Guide 11 1 11 SSTR Codes ...
Page 110: ...11 2 Quick Check 600 800 Series User s Guide ...
Page 111: ...Quick Check 600 800 Series User s Guide 12 1 12 Special Codes ...
Page 112: ...12 2 Quick Check 600 800 Series User s Guide ...
Page 114: ...13 2 Quick Check 600 800 Series User s Guide ...
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