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UPU (Universal Postage Union) S18 4-State

Category: 1D Symbologies

  • UPU 4-state is a variable-length and alphanumeric barcode.
  • It is used to add identifier tags to UPU postal items.
  • It has two possible encoding formats, 18C and 18D.
  • It can encode 19 or 25 codeword with up to 6 or 12 error correction codewords respectively.
  • It uses a Reed-Solomon error detection and correction scheme.
  • The Universal Postage Union manages the UPU S18 4-State specification.
  • Relevant enum value: SDCSymbologyUPU4State