KNX IP Router
Product Manual
11
@2019 INTERRA
PM190205012AEN
2.4) IP Bootloader / Boot Mode
The IP bootloader function is used to completely rewrite the flash memory content and is not just a simple application
download. Both communication stack and application software are downloaded. The download tool is a separate tool
independent from ETS.
The firmware update procedure via IP is executed by a Web front-end and makes use of special messages to speed up the
process. To be protected, their contents are encrypted.
Note : Entering Boot Mode is equivalent to activating the IP bootloader function.
3.) OPERATIONAL DESCRIPTION
In network installations ITR901-001 can be used as KNX IP area coupler or KNX IP line coupler. With its default settings the
device operates as is supposed to.
3.1) IP Coupler Application
When ITR901-001 receives telegrams (for example during commissioning) that use physical addresses as destination
addresses, it compares the physical addresses of the receiver with its own physical address and decides on that whether it
has to route the telegrams or not.
When ITR901-001 receives telegrams that use group addresses as destination addresses, it reacts in accordance with the
parameter settings. During normal operation (with default settings), ITR901-001 only routes telegrams whose group
addresses are entered in the filter table.
If ITR901-001 routes a telegram and does not receive an acknowledgement, or if a bus device discovers a transmission
error, the coupler repeats telegrams up to three times (depending on the corresponding parameter that is set by ETS). With
the parameters „Repetitions if errors...“, this function can be set separately for each line. It is recommended to use t
he default
parameter setting.
IP Coupler 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 ETS automatic
assignment setting of the IP address is required. If no DHCP server is found by this setting device starts an AutoIP procedure
and autonomously assigns the IP address. The IP address that ITR901-001 receives during its start-up (via DHCP or AutoIP)
is retained until next start-up (e.g. due to power off or reprogramming). If the IP address of the device is supposed to have a
fixed assignment a fixed IP address (as well as subnet mask and standard gateway) can be set by ETS.
Note : ETS does not provide an unload procedure for applications.
3.2) IP Network
ITR901-001 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 these telegrams are sent as multicast telegrams to the multicast IP address
224.0.23.12 port 3671. The multicast IP address 224.0.23.12 is the defined address for the KNXnet/IP by KNX Association
in conjunction with the IANA. It is recommended to use this default address as defined. Only if it becomes necessary due to
the existing network, the address can be changed as shown in chapter 4.3 KNX Multicast Address.
