EAN-139780742557291   EAN-13 barcode 9780742557291
Product NameThe Politics Of Human Rights Protection: Moving Intervention Upstream With Impact Assessment
LanguageEnglish
CategoryBook / Magazine / Publication
Short DescriptionHardcover
Created11-22-2012 1:08:41pm
Modified09-25-2017 1:43:07am
MD5e3e20fee60b248495c31b1a0a167993d
SHA2569f88f36a21c1ddc16ba57b88879a21d35d006e7dbbfe6755061ec9b16fea2563
Search Googleby EAN or by Title
Query Time0.0054572

Code 128 is a high-density 1D barcode symbology. This barcode set makes use of the entire 128 ASCII characters which include letter, number and symbols.

Code 128 Barcode

As with all barcodes, there are indicators to identify where the barcode starts and stops. These are marked in yellow below. Code 128 also has a check character which has been marked in green. The remainder of the barcode is the data being encoded. The text below the barcode is optional and is for human consumption in the event the barcode can't be scanned or if people also need to know what the code means.

Code 128 Barcode

Each character in the barcode symbol is composed of three bars and three spaces. Each bar or space must range from 1-4 units and the sum of all the width of all bars must work out to an even number. The stop marker is special because it adds an extra bar of 2 units at the very end (4 bars and 3 spaces). There are three different start markers to to identify which code set is being used. To represent all 128 characters, the code sets can be within a single barcode as needed by using control characters 98-101 (depending on the code set).

The check character is calculated by summing the value of each character and multiplying it by its position. The start character is also part of the sum but is added without weight (multiply by 1 just like the first encoded data character) then when you have the sum take the modulo 103 remainder. This gets a little more complex when mixing modes within a single barcode.

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