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KNX IP Interface

A KNX IP interface connects an ETS computer to the KNX bus over the LAN. Unlike an IP router, it does not forward telegrams between lines, it is exclusively a gateway for ETS and visualisation systems.

IP Interface vs. IP Router

Both device types enable ETS tunneling (programming over the network). The IP router additionally provides routing: it connects two TP lines via IP and filters telegrams like a line coupler. The IP interface cannot do this, it is only an access point.

For an installation requiring only ETS access and visualisation (no IP backbone), an IP interface is sufficient. If multiple lines are to be connected via IP, IP routers are needed.

Key Facts

  • Tunneling: max. 4 simultaneous connections
  • IP interface: no routing between lines
  • IP router: tunneling + routing + galvanic isolation
  • ETS discovers devices automatically via UDP discovery
  • Remote access only via VPN or KNX IP Secure

Related Articles

KNXnet/IP – KNX over IP Networks
KNXnet/IP is the standard for KNX communication over IP networks. It enables remote ETS programming (tunneling) and connects multiple TP lines via an IP backbone (routing).
KNX Secure – Encryption for the Bus
KNX Secure is the security standard for KNX communication. It protects bus telegrams against eavesdropping and manipulation, both on IP networks (IP Secure) and on the TP cable (Data Security).
KNX Line Coupler and Area Coupler
A KNX line coupler (LC) connects two lines and filters telegrams, only telegrams with destination GAs in the filter table are forwarded. It reduces bus load and provides galvanic isolation.
KNX ETS – the Engineering Tool Software
The KNX Engineering Tool Software (ETS) is the only official tool for configuring and commissioning KNX projects. Developed and maintained by the KNX Association, it runs on Windows.

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