This page last changed on Jul 02, 2010 by fahmi.

Hi, I need to learn some more information about the KNXnet/IP telegram structure (Fields and the length of each field), my ultimate goal is to know the maximum length of a KNXnet/IP telegram length in order to calculate the maximum added load by a KNX system on an IP network.
Would you please send me any information related to this subject to
Thanks and Regards

Hi, I am also interested in getting the specification of KNXnet/IP protocol. Please, send it to me too.
Kind regards,

Posted by rlratchev at Jul 03, 2010 09:10

KNX specification is not a freely distributable document. You will need to purchase it from the KNX association.

Posted by juha at Jul 03, 2010 09:31

There's some (free) information on Wikipedia. As a rule for your network load here are some numbers. Each packet is transmitted as UDP, resulting in this:

  • UDP header: 42 byte
  • KNX header: 18 byte
  • KNX payload: 2-16 byte (16 for a text string message, typical payload ON/OFF would be 2 byte)
Posted by jfalkenberg at Jul 04, 2010 11:12
Document generated by Confluence on Jun 05, 2016 09:31