Barcode Online Reference
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The Code 49 bar code is a multiple-row bar code that can encode the full ASCII character set below ASCII 128. Up to 49 alphanumeric characters or 81 numeric characters can be encoded. These characters are encoded into two to eight rows. Each row is divided by a separator bar. The top and bottom of the symbol also have separator bars that extend to the ends of the minimum quiet zones.
All characters are encoded in double-density mode. This means that two characters are encoded into one character width, making the size of the bar code smaller. If your input string contains a sequence of at least five digits, these are compressed even further. Sequences of five digits are represented as three code characters. If the number of digits is a multiple of five plus four, the last four digits are also represented as three code characters. If the number of digits is a multiple of five plus three, the last three digits are represented as two code characters. If the number of digits is a multiple of five plus two, this is considered to be four followed by three, and these are represented as three and two code characters. If the number of digits is a multiple of five plus one, the last digit is represented by a single code character.
The Code 49 bar code has three forms of error detection. Parity is checked for each character, each row contains a check character as the last row character, and two or three check characters are always appended to the end of the bar code. Symbols with six or less rows have two checksum characters. Symbols with seven or eight rows have three checksum characters.
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