Weinzierl KNX IP LineMaster 762.1 secure Operation And Installation Manual page 25

The setting "Automatic" activates encryption if both objects to be connected can communicate
encrypted. Otherwise encrypted communication between the objects is not possible.
In the overview of communication objects in the ETS project, secured objects can be recognized
by a shield symbol:
A separate key is automatically generated by the ETS for each secured group address. These
keys can also be checked in the ETS panel Reports – Project Security. To enable all devices to
communicate with a secure group address, the keys must be known to all. Therefore a download
must be made into all devices that use this group address when a key is created or changed. A key
is changed by the ETS e.g. when the encryption of a group address is switched off and on again.
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