Weinzierl KNX IP LineMaster 762.1 secure Operation And Installation Manual page 33

Acknowledgement (ACK) of individual addressed telegrams
The following settings are possible:
▪
Always
An acknowledge is always generated for received individual addressed telegrams (from
KNX).
▪
Only if routed
For received individual addressed telegrams (from KNX), an acknowledge is only generated
when forwarding to IP.
▪
Answer with NACK
Each received individual addressed telegram (from KNX) is answered with NACK (Not
Acknowledge), i.e. communication with individual addressed telegrams on the
corresponding KNX line is no longer possible. Group communication (group telegrams) is
not affected by this. This setting can be used to prevent manipulation attempts.
If the response is NACK, access to the device via KNX is no longer possible. The
parameterization must be done via IP.
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