The core of a KNX telegram is the payload field. Around the payload, seven extra fields are added.
This is the overview of all fields within a telegram, the order corresponds with the actual order within the telegram:
- Control Field
- Source Address
- Destination Address
- Address Type
- Hop Count
The minimum length of a KNX telegram = 6 octets.
The maximum length of a KNX telegram = 263 octets.
Exception: data link layer acknowledgements contain only 1 octet.