This opens a dialog box to set the BCU Key. In order to set the BCU Key, the associated ETS project must be open. When a BCU Key is set, all the KNX devices in this project that support this feature will be locked during the download process using this (single) password. This means that these devices cannot be read out or changed later without this password. Please note that only the manufacturer is able to reset the BCU key of a password protected device should you have forgotten or lost the BCU key.
Change
Enter a new password once and then click OK to confirm.
Disable
To disable password protection, enter the current password and click the 'Clear BCU Key'.