Skip to main content

What is Barcode

What is Barcode


Barcodes encode numeric or textual information in a printable, machine-readable form. The use of barcodes can significantly reduce cost of warehouse management and inventory. Two main forms of barcodes exist today: Linear or normal barcodes encode data over a horizontal stretch of space or one dimension. This kind of barcode typically encodes between four and forty digits or characters. So called area codes encode data in two dimensions, resulting in much higher density which allows for up to three thousand characters to be encoded.

Most linear barcode types will only encode numbers or digits. Two notable exceptions are Code 39 and Code 128 which can also encode alphanumeric characters like letters. Two dimensional area codes usually encode numbers, letters and special characters.

The most common linear barcode type is Code EAN which is used to encode article numbers in retail. It's used throughout the world with the notable exception of the USA which uses a related code, Code UPC, for the same purpose. A special form of Code EAN carries a so called Addon, a smaller barcode next to the main barcode that can encode pricing information and the like. Code EAN with a five digit Addon is used to encode ISBN (International Standard Book Number), while Code EAN with a two digit Addon is used to encode ISSN (International Standard Serials Number).

Other notable linear barcode symbologies and their applications include Code 39 (used for pharmaceuticals), Code 128 (warehouse management and retail) and Code Two-Of-Five (warehouse management and inventory).

The most common two dimensional area codes are PDF417 and Datamatrix, both of which are used in manufacturing, package tracking and similar applications which require large data amounts to be encoded.

Barcode Checksums

To ensure safe and error free reading and scanning of barcodes, all common barcode symbologies support so called checksum or check digit schemes. A checksum or check digit is an additional character or number that is calculated from the encoded data and appended to the barcode. While reading the barcode the scanner or reader can verify the checksum and determine if the barcode was scanned correctly. This is especially important if the barcode can easily be damaged or be tampered with. Simple check digit systems like the sort that is used with most linear barcodes will only detect simple errors, like a missing character. More sophisticated systems, especially those used with area barcodes can not only detect but also repair any damage that may have occurred to the code.

Barcode Applications

Today barcodes enjoy wide spread use through all types of businesses. The first major application of barcodes was in the retail sector where the codes would encode article numbers, manufacturer data and pricing. Another prominent use of barcodes is in the transport industry where the codes carry address and tracking information. Finally, two dimensional area codes have recently gained much popularity for use in personal identity cards, drivers licenses and so forth. They are also used for the tagging of electronic parts like computer or memory chips.


Popular posts from this blog

6 Steps You Can Take To Speed Up Your Computer’s Performance

We live in a fast paced world and we’re always looking for the fastest way to get things done. We barely have time to wait for our burger at the local fast food restaurant, our coffee to brew, our microwave popcorn to pop, so who has time to wait around for a slow computer? Barring adding more RAM to your computer, there are 6 steps you can take to speed up your computer’s performance. Most of these steps will allow you to speed up your computer, free of charge since they are applications already installed on your computer. One of the first steps you should take is to empty the Recycle Bin. It’s easy to do. Just point your cursor to the Recycle Bin icon on your desktop, right-click, and choose “Empty Recycle Bin.” Next, open up your Internet Explorer, go to Tools, Internet Options. Click on “Delete Cookies,” then on “Delete Files.” In the window that appears, check “Delete all offline content” and click OK. Once that’s done, click OK to close the Internet Options window, and close ...

SEO Tasks You Should Do Every Day

There are five simple tasks that you need to do daily to keep your site on top. Here they are:  1. You need to start off by managing your links . This involves making sure that none of your current links are dead, and you should also check if there are any sites linking to you that you don’t know about. If your site consists of a large number of links you should make sure that they aren’t getting out of control and get rid of anything that is no longer relevant. Also make sure that your links are sufficiently labelled to reflect the page that they link to. 2. Re-order your links, putting the best ones first. And putting them into categories if you have a high number of links. If you have a links page with 25+ links it is a good idea to turn it into a directory of some sort. This can even help you in getting more links to your site in exchange for back links on the directory that you have created. Also check the sites that you link to and make sure that any back links that are...

Off-Page Search Engine Optimization Methods

Off-Page Search Engine Optimization Methods On-page search engine optimization is definitely one of the key methods if a website owner would like to improve the results for his or her website's searchability. However, on-page SEO often entails technical skills. Why? Not a lot of people are HTML enthusiasts. This is often what needs to be tweaked to do an excellent job in optimizing web pages. What if a geek friend already did the on-page optimization and now you want to know how you can contribute to the "search engine goodness" of your website? Off-page optimization is the next step. And the results you will have to pine for are one-way backlinks. Why? This is how many of the major search engines such Google, Yahoo! and MSN rank websites. The more backlinks from relevant sites with good page rank, the merrier. So how exactly do you gather backlinks? It's not an easy task but it's definitely less nerve-wracking than HTML if you are not the techie type. H...