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Barcode Reading: The Basics

Every single product comes with a barcode that is usually read by a scanner. But you can also read the barcode manually. A scanner easily reads the barcode in seconds but in theory you do not need it to be able to read the code. Whether you’re just curious to see if you can match up your skills or you need to do an inventory by yourself with the c# barcode scanner, you will learn more here if you continue to read the article.

There is a need to understand the structure of the barcode using the c#barcode scanner technique before trying to read it.

The quiet zone refers to the margins around the barcode symbols. The margins are expected to be wide enough for the scanner to read it effectively. Each margin should at least be ten times wider than the narrowest bar width.

Inside the barcode, there are characters which is different for every barcode. Common characters are letters, asterisks, and the like.

The data refers to the pattern of black bars and white spaces that can be wide or narrow. They can have four different widths.

The check digit is a number found on the end of the data before the stop character. It essentially doublechecks for any printing errors that may have occurred when the barcode was created.

The barcode that is easily read manually is the 12 digit UPC. There are certain barcodes that have numbers printed below it while some do not have it. We’ll teach you how to “read” the bars to calculate the 12 digit number that the barcode represents. First, find the sets of long lines that extend down past all of the others – there should be three sets made up of two lines each. These lines are not interpreted as numbers by the scanner, but they do break up the data into two chunks that are read differently – we’ll refer to these as left and right. Next, make sure you can tell apart the different bar and space widths. In order of smallest to largest, we will refer to these as numbers 1,2,3, and 4. Starting with the left part, start with the first space you see and write down its corresponding size. Do this for all spaces and bars until you reach the center. Break these up into sets of four – white-black-white-black. On the right chunk, you’ll do the same thing but instead, start with the first black bar you see. The pattern is completely reversed but still in four.

You obtain two sets of numbers. Each of these four-digit numbers can be translated into one digit. Just search for the corresponding values in the net to learn more here about the c# barcode scanner. That’s how you determine your 12 digit UPC number. Be sure to check your work to see if you got the correct number. This c# barcode scanner should be of much help to you.