This test can be used to check whether the bus connection cable is connected with the correct polarity and whether device is supplied with bus voltage.

Test KNX 24 V DC type SELV

Safe-state mode

Safe-state mode stops the execution of the application program that has been loaded.

Only the system software of the device is still running. ETS diagnostic functions and programming of the device are possible

Execute safe-state mode and master reset

Activating safe-state mode

  1. Switch off bus voltage or disconnect device from the KNX.
  1. Wait approx. 10 s.
  1. Press and hold down the programming button (1a).
  1. Switch on the bus voltage or connect device to KNX (1b).
  1. Release the programming button only once the programming LED is flashing slowly (2).
  • Safe-state mode is activated.

Briefly pressing the programming button again switches programming mode on and off just like in safe-state mode. If programming mode is active, the programming LED no longer flashes.

Deactivate safe-state mode

  1. Switch off bus voltage or disconnect device from the KNX.
  1. Wait approx. 10 s or execute ETS programming operation.
  • Safe-state mode is deactivated.

Master reset

The master reset resets the device to the original settings (physical address 15.15.255, firmware is left alone). The device must then be restarted with the ETS.

In secure mode: A master reset deactivates the device safety. The device can then be restarted with the device certificate.

Perform master reset

  • Safe-state mode is activated.
  • Press and hold the programming button for > 5 s (3).
  • The programming LED flashes rapidly (4).
  • The device executes a master reset, restarts and the LED turns off (5).
  • The device is ready for operation again after approx. 5 s.