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KNX Secure Guide: 3. Factory Reset

To prevent a device from becoming unusable in the event of losing the project and/or the Tool Key with which it is programmed, it is possible to return it to the factory state restoring the FDSK by following the steps below:

  • Put the device in safe mode. This is achieved by powering it up with the programming button pressed until the programming LED flashes.
  • Release the programming button. It keeps flashing.
  • Press the programming button for 10 seconds. While pressing the button, it lights in red. The reset occurs when the LED turns off momentarily.

This process, apart from the Tool Key, also deletes the BCU password and resets the individual address to the value 15.15.255.

An unload of the application program also deletes the Tool Key and the BCU password, although in this case the ETS project with which it was programmed is required.