# Configuring Significant Positions to Read in Barcode String

The positions in the barcode string are associated with a number between 1 and 1024. The first position of the string is 1 and the last is 1024.

The significant positions must be specified following the rules described in the table below. Barcode strings:
Description | Significant positions | Valid configuration | Barcode string to match with pre-defined string
--- | --- | --- | ---
Significant positions in order | 1,2,3,7,8 | Ok | ABCGH
Significant positions in optional order | 7,1,2,3,8 | Ok | GABCH
Range of numbers | 1–3,7-8 | Ok | ABCGH