KNX Serial 870

KNX Serial 870

The KNX Serial 870 is a serial RS-232 interface. It uses the proven FT1.2 protocol (PEI 10) as telegram format. The device is mainly used as an interface for older applications that use the FT1.2 protocol for the connection to KNX.

Furthermore, the device supports the BAOS protocol for accessing data points. However, for new implementations, we recommend our newer BAOS solutions as serial modules or via USB or IP.

If you have any questions about connecting your application to KNX, please contact our technical support.

Technical data

Mechanical Data

  • Housing: Plastic
  • DIN rail mounted device, width: 18 mm
  • Weight: approx. 45 g


  • Learning key for KNX


  • Learning LED (red)
  • Signal-LED (green) for KNX-Connection

Power supply

  • The device is supplied by KNX bus.
  • Current consumption: ca. 10 mA


  • KNX: KNX connector
  • RS-232: SUB-D connector (female, 9 poles),
  • cable length max. 5 m