KNX IP INTERFACE VS KNX IP ROUTER
A KNX IP Interface allow you to program and connect to the KNX bus over IP. It supports direct tunnelling connections and most IP Interfaces support multiple simultaneous connections.
A KNX IP Router also allows you to program and connect to the bus but can be used to connect different parts of a KNX system together over IP. It does this using an additional multicast connection and manages the KNX traffic using a filter table in the same way a line coupler does. The Multicast connection can also be used as a bus interface for programming and external devices.
Third party systems will connect to KNX with either a tunnelling (IP INTERCAFE/ROUTER) or a Multicast (IP ROUTER ONLY) connection . Because of this we generally recommend a KNX IP Router as it has both options, ensuring compatibility.
KNXne/IP Tunnelling
An IP tunnel is an Internet Protocol (IP) network communications channel between two networks. It is used to transport another network protocol by encapsulation of its packets.
KNXnet/IP Tunnelling is the primary method of interfacing
to a KNX system and allows for a point-to-point communication (unicast) from a
single external device to the KNX system.
This is the simplest form of IP communication within KNX
and is easy to understand as you only need to point an external device at the
IP address of the KNX IP interface. This allows you to see all traffic from the
bus and communicate directly to individual devices such as for ETS programming.
It is also commonly used for external systems to communicate with KNX.
APPLICATION OF USE:
KNX IP Interface is mainly used for connecting KNX system
to third party controllers & for connecting ETS software programming over
IP.
KNXnet/IP Routing
KNXnet/IP Routing is a multicast-based telegram, which allows a KNX IP device to perform the function of a Twister pair to IP coupler. This means the backbone of a KNX system can be Ethernet-based, allowing a much higher speed of transmission and more flexibility when installing.
Multicast is a group-orientated connection method
where, instead of using device IP addresses, all devices point to a
standard multicast address. This allows all telegrams to be seen by all KNX IP
devices looking at this address. The KNX Association has reserved multicast
address 224.0.23.12 but any address could be used as long as it is the same on
all devices.
APPLICATION OF USE:
KNX IP Router is mainly used
to connect 2 or more Lines or Areas to communicate over IP backbone, earlier
Line couplers are used to connect which was working on TP network.
IP router can send more
telegrams over IP backbone than TP network used by Line/Area Couplers.
·
Fast communication between KNX lines
·
Option to extend an existing KNX system beyond
the building by using LAN and WAN connections
·
Direct forwarding of KNX data to every network
user
·
KNX remote configuration from every network
access point
·
Can be used in a new or an existing KNX network
·
Reduces the bus load by means of filter tables,
which determine which bus telegrams are forwarded to and from the bus line or
blocked. The ETS software automatically generates the filter table when the
device is configured and commissioned.
· When
the physical address is assigned, ETS is used to automatically specify the
coupler function (area coupler: main line 1 – 15; line coupler: line 1 – 15)
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