Signature

Signatures are the encoding format that the taggers use to communicate. Signatures are created by activating and deactivating the basic infrared signal for specific lengths of time. The patents specify a +/-10% tolerance for all timings.

• Pre Sync - Active - 3ms
• Pre Sync Pause - Inactive - 6ms
• Sync - Active
  • 6ms - Beacon signature
  • 3ms - Tag/Packet signature
• Data bits (in order from most to least significant)
  • Pause - Inactive - 2ms
  • Data Bit - Active
    • 1ms - 0
    • 2ms - 1
  • [..]
• Special Format Pause - Inactive
  • 72ms - Tag signature (older versions of the standard allowed as low as 56ms)
  • 80ms - Checksum signature
  • 25ms - All others