Technical Manual – IP Router SCN-IP100.03
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4.4 KNX Multicast Address
The following parameters are available:
Figure 15: Settings – KNX Multicast Address
The following table shows the settings for the KNX multicast address:
ETS-Text
Dynamic Range
[Default value]
Comment
Use system multicast
No
Yes
Setting whether system multicast address
is used or can be set individually
The following settings are displayed when "
No
" is selected
Byte 1
239
The value 239 is fixed and cannot be
changed
Byte 2 – 4 [0 – 255]
0 … 255
[0]
Setting the address for the respective
byte
With the setting "Use system multicast -
Yes
" the address is fixed to
224.0.23.12
Table 5: Settings – KNX Multicast Address
IP Routing Multicast Address:
The KNX multicast address determines the destination address of the IP telegrams of the KNX/IP
Router. The default is 224.0.23.12. This is the address for KNX IP devices specified by the KNX
Association together with the IANA. They should only be changed if there is, caused by the existing
network, the need to do so. It must be noted that all KNX IP devices to communicate with each other
via IP, must use the same IP routing multicast address. An IP message can thus be sent to multiple
recipients through the multicast addresses - if they are in the same multicast group. For manual
settings, the multicast addresses 239.0.0.0 – 239.255.255.255 are reserved.
If via KNX/IP routing a new IP routing multicast address gets loaded into the device, so the ETS gives
the error message "Download Failed". A new download should then finish without problems. This
behavior has systemic reasons.
