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Bar Coding Explained
Full Version Only
Not Available in Compact Version of the software .
Use of Barcode in Business
Bar codes are like a printed version of the dit-dot pattern of telegraphic morse code. Different sequence of bars and spaces are used to represent different characters. Sets of these patterns are grouped together to form the set of barcode symbols. There are many types of bar code systems each having their own special characteristics and features. Most systems were designed to meet the needs of a specific application or industry. For example the UPC barcode was designed for identifying retail and grocery items while Code 3 of 9 or Code 39 is widely used for business, industrial and numerous other applications. We will have a look at various barcode systems below:
CODE 39 (Normal and Full ASCII versions)
code39.gif
The Normal CODE 39 is a variable length barcode that can encode the following 44 characters:
1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ-. *$/+%.
Code 39 barcode is the most popular barcode in the non-retail world and is used extensively in manufacturing, military, and health applications. Each Code 39 bar code is framed by a start / stop character represented by an asterisk (*). The Asterisk is reserved for this purpose and may not be used in the body of a message. The software automatically adds the start and stop character to each bar code therefore you should not include them as part of your bar code text. If your bar code text contains lower case characters, the software will convert them to upper case. If your bar code message contains any invalid characters, the software will prompt you with a warning message.
Code 39 optionally allows for a (modulo 43) check character in cases where data security is important. The health care industry has adopted the use of this check character for health care applications.
Another feature of Code 39 allows for concatenation of two or more bar codes. It is sometimes advantageous to break long messages into multiple shorter messages. If the first data character of a Code 39 symbol is a space, some readers will store the remainder of the symbol in a buffer and not transmit the data. This operation continues for all successive Code 39 symbols with a leading space, with each message appended to the previous one.
When a message without a leading space is read, it is appended to the previously scanned data in the buffer and the entire buffer is transmitted as one long message.
The FULL ASCII version of Code 39 is a modification of the NORMAL (standard) version that can encode the complete 128 ASCII character set (including asterisks). The Full ASCII version is implemented by using the four characters: $/+% as shift characters to change the meanings of the rest of the characters in the Normal Code 39 character set. Because the Full ASCII version uses shift characters in combination with other standard characters to represent data not in the Normal Code 39 character set, each non-standard character requires twice the width of a standard character in a printed symbol.
Because all of the characters used to implement Full ASCII Code 39 are part of the Normal Code 39 character set, readers that do not support Full ASCII Code 39 will still read Full ASCII Code 39 symbols. The barcode reader will output shifted characters as if they were normal Code 39 characters.
UPC-A, UPC-E, and UPC Supplemental
UPC-A with Supplemental UPC-E
upc-a.gif
upc-e.gif
UPC-A is a 12 digit, numeric barcode used in retail applications. UPC-A symbols consist of 11 data digits and one check digit. The first digit is a number system digit that normally represents the type of product being identified. The following 5 digits are a manufacturers code and the next 5 digits are used to identify a specific product.
UPC numbers are assigned to specific products and manufacturers by the Uniform Code Council (UCC). To apply for a UPC number or for more information, you can contact the UCC by visiting their website.
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