KNX USB Interface 311

This interface is for establish a bidirectional connection between a PC and the KNX installation bus. The USB connector has a galvanic separation from the KNX bus. Both ETS (Engineering Tool Software) versions ETS3 or later and some visualization tools support this interface.

311 KNX USB Interface Schaubild

Technical data

Mechanical Data

  • Housing: plastic
  • DIN rail mounted device, width: 1 TE


  • Signal LED (green) for USB-connection
  • Signal LED (yellow) for communication

Power supply

  • The part of circuit for communication over USB is supplied by the connected PC / Laptop, correct operation is signalled by the green LED (USB).
  • Power consumption: < 200mW
  • The part of circuit for communication over KNX is supplied by KNX bus.
  • Power consumption: < 100mW


  • KNX connector
  • USB connector type B
  • Wire length max. 5m


  • ETS (Engineering Tool Software) ETS3 or later