Interleaved 2 of 5

Numeric-only code, it requires an even number of digits in the string to be encoded. It can have from 2 to 30 digits. Also called “25 Interleaved”.

*The number of encoded digits must be even (multiple of 2). If you use a checksum, then you need to send an odd number of digits (the calculated checksum will add one character, making the total data length an even number).