KNX IP Router 750

Interface between EIB/KNX-Bus and Ethernet (DIN rail mounting device)
KNXnet/IP Routing & Tunnelling

Application area
The KNX IP Router forwards telegrams between different lines via LAN (IP) as a fast backbone. With it this device compensates the EIB/KNX line coupler. The KNX IP Router can also be used in ETS3 as a programming interface. There are two ways to assign an IP-address, get the IP-address from a DHCP-server or configure it with ETS (as ETS parameter). It has an external 12 V to 24 V Power Supply or can alternatively be powered via Power-over-Ethernet (IEEE 802.3af).

Ethernet and KNX bus
The decisive advantage of the Ethernet is its high bandwidth at relatively low cost and its very widespread use. Today, the Ethernet is not only used for networking computers in the office, but also for multimedia applications in the home and for industrial automation.
Despite, and indeed because of, the high transmission speeds, LAN networks cannot replace the KNX bus. Instead, the combination of KNX TP1 and LAN provides an optimal solution for future building automation. KNX TP1 is primarily suited for local control, while the LAN is used for inter-system communication. The transmission of control commands can take place in a LAN network together with Internet use, PC networking and multimedia. Overall, this results in a hierarchical architecture for building networking.

Routing in hierarchical architectures
One major motivation to extend the KNX system with the Ethernet is to increase the transmission capacity of the overall system. Although the transmission speed of 9600 bit/s is fully adequate to form a bus line with up to 256 participants, a higher bandwidth may be needed in the backbone if a system has numerous lines that are connected by a line coupler. This is especially critical if the system contains devices used for purposes such as visualization to which all telegrams need to be transmitted. In this case, there can be no selective routing.
Here, the high bandwidth of a LAN network offers an optimal solution. While with KNX TP1 a maximum of only 50 telegrams can be transmitted per second, transmission via LAN exceeds 10,000 telegrams at 10 MBit/s.
Since the Ethernet is of great significance to the installation system as the backbone, it was standardized in KNX. The Routing subtopic of the KNXnet/IP specification (formerly EIBnet/IP) describes how KNX/IP gateways forward telegrams via IP. For forwarding via the Ethernet, the KNX telegrams are individually packed in UDP/IP telegrams and sent via the Ethernet as multicast telegrams. All KNX/IP routers in the network can receive these telegrams simultaneously and use their routing tables to determine whether to forward the telegram into the connected KNX line.

Mechanical data
· Housing: plastic
· DIN rail mounted device, width: 2 TE

Bedienelemente
· Learning key for EIB/KNX

Anzeigeelemente
· Lerning LED (red)
· Signal LED (green) for EIB/KNX
· Signal LED (green) for LAN

Ethernet
· 10BaseT (10Mbit/s)

Spannungsversorgung
· External power supply 12-24V AC or 12-30V DC
· Alternative: "Power over Ethernet"
· Power consumption: < 800 mW

Anschlüsse
· EIB/KNX connector
· LAN RJ-45 socket
· Screw connector for power supply