Null characters may be encoded in Code 39, Code 128 and most 2D barcode types such as Data Matrix. However, the null character represents the end of a data string in most applications, and therefore, any data encoded after it will usually be truncated by the barcode scanner or the application itself. In Data Matrix, the format ~dNNN represents the ASCII character encoded where NNN is the ASCII number. For example, ~d009 encodes a tab and ~d000 encodes the null character.
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