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Bulk Online Code 39Ext Barcode
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1. Enter
barcode data in Excel for print bulk labels. |
3. Generate sequence
numbers for make barcodes. |
2. Design barcode
label with text, logo. |
4. Print barcode
label sheet to Avery 5160, 5161, 5162 . . . |
5. Print barcode
label on command line. |
6. Add Ascii key to
barcode: Tab, Enter, File Separator. etc. |
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Right click each barcode to save to local.
Desktop version software can
export bulk barcode images to a folder |
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Barcode Technology - Code 39Ext
Barcode
Hide the description |
Code 39 Ext (Code 39 Extended)
supports all ASCII 128
characters by using double
character encoding.
For example, the lower-case
letter "a" is represented by
"+A". Because of the possibility
of misrepresentation of a
symbol, most bar code scanners
must be switched to extended
mode in order to recognize Code
39 Extended. |
Code 39 (also known as Alpha39,
Code 3 of 9, Code 3/9, Type 39,
USS Code 39, or USD-3) is a
variable length,
discrete barcode symbology. |
Valid characters:
0123456789[Space]ABCDEFGHIJKLMNOPQRSTUVWXYZ-.$/+% |
Code 39Ext is one of the many
barcode formats currently in
use. |
A Barcode is a method of
representing data in a visual,
machine-readable form. |
The barcode formats has two
categories: |
One-dimensional (1D) ---
Barcodes represented data by
varying the widths and spacings
of parallel lines. |
Two-dimensional (2D) --- Using
rectangles, dots, hexagons and
other geometric patterns to
represented data. |
Code 39Ext is 1D barcode.
Code 39 is restricted to 43
characters. In Full ASCII Code
39 Symbols 0-9, A-Z, ".", "-"
and space are the same as their
representations in Code 39.
Lower case letters, additional
punctuation characters and
control characters are
represented by sequences of two
characters of Code 39.
Code 39 is variable with
no fixed length. |
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Code 39 can be to produced in
different proportions: 2,0:1 and
3,0:1. This is the proportion
between the thin and the
thick lines of the code. As
higher the proportion, the wider
is the printed barcode with same
contents, but even better is
readability. |
The * character of Code 39:
The * character presented below
is not a true encodable
character, but is the start and
stop symbol for Code 39. The
asymmetry of the symbol allows
the reader to determine the
direction of the barcode being
scanned. This code is
traditionally mapped to the *
character in barcode fonts and
will often appear with the
human-readable representation
alongside the barcode.
In order to create this code do
not have to enter the stars: If
the text line shows *1234* you
just have to enter 1234 because
the stars are a fixed part of
Code 39. |
Check digit:
Since Code 39 is self-checking,
a check digit normally isn't
necessary. However, in
applications that require an
extremely high level of accuracy
a modulo 43 checksum digit may
be added.
To calculate the optional
checksum digit, follow the
following steps.
Take the value (0 through 42) of
each character in the bar code.
The start and stop characters
are not included in the checksum
calculation.
Sum the value of each of the
values of each of the characters
described in step 1.
Divide the result from step 2 by
43.
The remainder from the division
in step 3 is the checksum
character that will be appended
to the data message before the
stop character. |
Drawback:
Possibly the most serious
drawback of Code 39 is its low
data density: It requires more
space to encode data in Code 39
than, for example, in Code 128.
This means that very small goods
cannot be labeled with a Code 39
based barcode. However, Code 39
is still used by some postal
services (although the Universal
Postal Union recommends using
Code 128 in all cases), and can
be decoded with virtually any
barcode reader. One advantage of
Code 39 is that since there is
no need to generate a check
digit, it can easily be
integrated into an existing
printing system by adding a
barcode font to the system or
printer and then printing the
raw data in that font. |
Human Readable:
Most barcodes display their
corresponding values below them,
which makes it possible to human
read and manually enter
the barcode values into the
equivalent system when the
barcode label is worn out and
cannot be read by the barcode
scanner. |
Advantages:
Using Barcode system eliminates
the possibility of human error.
The error rate of manually
entering data is
significantly higher than that
of scan barcodes. Barcode
scanning is fast and reliable,
and it takes much less time than
manual data entry. Especially
when using a QR code, hundreds
of characters can be read and
entered into your system
instantly.
Using a barcode system can make
the working process simple and
easy, so it can reduces the
employee training time. It only
takes a few minutes to master
the barcode scanner to
collecting data, employees no
need to familiar with the entire
inventory or pricing process.
This also reduces the cost of
employee training.
|
History:
Code 39 was developed by Dr.
David Allais and Ray Stevens of
Intermec in 1974. Their original
design included two wide bars
and one wide space in each
character, resulting in 40
possible characters. Setting
aside one of these characters as
a start and stop pattern left 39
characters, which was the origin
of the name Code 39. Four
punctuation characters were
later added, using no wide bars
and three wide spaces, expanding
the character set to 43
characters. |
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