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4. Operational Description
In KNX network installations, 01548 is used as KNX IP line/area coupler to couple KNX IP and KNX TP (see also chapter 2 .2 IP (Secure) Routing) . It can be used in the com-
mon way without activation of Security and in ETS projects where Security is set to active . After connecting to KNX TP, 01548 operates with its default settings . Setting a
correct Individual Address is necessary . Only Individual Addresses x .y .0 are allowed .
4.1 IP Secure Router Application
When 01548 receives telegrams (for example during commissioning) that use Individual Addresses as destination addresses, it compares the Individual Addresses of
the receiver with its own Individual Address and decides on that whether it has to route the telegrams or not .
When 01548 receives telegrams that use group addresses as destination addresses, it reacts in accordance with the parameter settings . During normal operation (with
Group Telegram routing set to filter), 01548 only routes the telegrams whose group addresses are entered in the group filter table .
If a telegram is routed by 01548 without receiving the corresponding acknowledgement, i .e . due to a missing receiver or to a transmission error, the telegram will be
repeated up to three times (depending on the ETS setting) . With the parameters „Repetitions if errors . . .“, this function can be configured separately for each line and
both kinds of telegrams . It is recommended to use the default parameter setting .
IP Router is designed for use in 10/100 BaseT networks compliant to IEEE802 .3 . The AutoSensing function sets the baud rate (10 Mbit or 100 Mbit) automatically . IP
address can be received from a DHCP server . For this, the automatic assignment setting of the IP address can be set by ETS (“obtain an IP address automatically”) . If
set so and no DHCP server is found, 01548 starts an AutoIP procedure and autonomously assigns the IP address . If 01548 is supposed to have a fixed IP address (as
well as subnet mask and standard gateway) it can be set by ETS .
4.2 IP Network
01548 sends telegrams from/to the TP network to/from the IP network in accordance with the KNXnet/IP protocol specification . According to the default setting, IP
telegrams are sent as IP Multicast to the IP address 224 .0 .23 .12 port 3671 . The Multicast IP address 224 .0 .23 .12 is the defined address for KNXnet/IP by KNX Associa-
tion in conjunction with the IANA . It is recommended to change this address only when it becomes necessary due to the existing network .
Important notes:
• All KNX IP devices that are intended to communicate with each other via IP must have the same IP multicast address .
• Multicast IP address 224 .0 .23 .12 may need to be changed in respect of the network type and of the network components´ settings .
• IGMP (Internet Group Management Protocol) is used for IP Routing and Discovery .
• If problems occur for IP address assignment, please ask your network administrator .
• According to the topology, Individual Addresses that are used for Tunneling channels always have to be assigned in the range of subline addresses . Detailed informa-
tion about additional Individual Addresses for (Secure) Tunneling can be found in chapter 5 .4 IP (Secure) Tunneling Address Assignment .
Operational Description