Interleaved 2 of 5 (ITF)
The ITF is a bar code symbology used in industrial and retail applications. Dr David Allais invented this symbol and AIM USA developed the Uniform Symbology Specification. The UCC recognises this symbology for shipping container marking in the Application Standard for Shipping Container Codes.
Character Set is 0-9.
Encodation - The ITF pairs characters and encodes the first digit of the pair on five bars and the second digit of the pair on the five interleaving spaces. Two of the five spaces or bars used to encode a character are always wide.
Start/Stop patterns - Starts with four narrow elements beginning with a bar, and stops with a wide bar followed by two narrow elements.
Code Type - Binary, varying length. I 2 of 5 requires an even number of digits to encode information.
Human-Readable - Optional, though it is typically used.
Check Character - Optional, however, Modulus 10 required when using the SCC-14 specification.
Encoded Information - Contingent upon data requirements although as previously stated, an even number of digits is required. A leading zero is used if there is an odd number of digits.
Allowable Sizes - minimum "X" dimension: .0075 inches.
Wide to Narrow Ratio:
2:1 to 3:1 with "X" dimension > .020 inches.
2.2:1 to 3:1 with "X" dimension < .020 inches.
The SSC-14 specifications outline "magnifications" that are allowable.
Allowable Symbol Height - The greater of .25 inch or 15% of the symbol length.
This is an Interleaved 2 of 5 symbol encoding the data 1998