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Some barcode types, or symbologies, encode only numbers while others encode letters and numbers. Other barcode types can actually encode files, pictures and other binary data. Here is a basic breakdown of a few barcode types and what they encode:
Barcode symbology | Types of data encoded |
Code 39 | Numbers and upper case letters with a few symbols |
Code 128 | All numbers, letters and punctuation plus ASCII 0 to 127 |
Data Matrix | All numbers, letters and punctuation, ASCII 0 to 127 plus files and bytes. |
Interleaved 2 of 5 | Numbers only |
MSI Code | Numbers only |
PDF417 | All numbers, letters and punctuation, ASCII 0 to 127 plus files and bytes. |
Postnet | Numbers only |
If the intended use of the barcode fonts is for printing, check the type of data to encode:
If the intended use is a barcode component or label printing application, check the type of data to encode:
In a study at Ohio University, several different bar code symbologies were tested to determine their accuracy and are listed below. Keep in mind that a well-trained data entry operator will usually make a data entry error once every 300 keystrokes. Therefore, even implementing the least accurate symbology is a huge step forward to increase production and reduce data entry errors. The most inaccurate symbology (UPC) is used in the retail industry.
Barcode Type | Worst Case Accuracy | Best Case Accuracy |
Data Matrix | 1 error in 10.5 million | 1 error in 612.9 million |
PDF417 | 1 error in 10.5 million | 1 error in 612.4 million |
Code 128 | 1 error in 2.8 million | 1 error in 37 million |
Code 39 | 1 error in 1.7 million | 1 error in 4.5 million |
UPC | 1 error in 394 thousand | 1 error in 800 thousand |
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