User Manual

Network architecture
KNX architecture (ALN)
14
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The L-Switch filters the package on the basis of the subnet/node ID or group
ID. It automatically learns the topology and forwards the data packets
accordingly. The L-switch does not have to be configured. Unlike the router,
there is no need to take account of any addressing limits (allocation of Subnet
ID or Group ID).
LonWorks has physical and logical repeaters. The physical LonWorks repeater
does not filter the data packets. It regenerates the electrical signal. One
physical LonWorks repeater can be used in the path between any two devices
within a segment.
In logical repeaters, the data packet is processed by the neuron chip. This
enables several logical repeaters to be connected in series. The disadvantage is
that the logical repeater must be configured, and that owing to the limited size
of the buffer, it cannot be used for large data packets, that is, for
BACnet/LonTalk.
14.3 KNX architecture (ALN)
KNX is an open standard that conforms to EN 50090 and ISO/IEC 14543. See
www.knx.org. KNX corresponds to the former European Installation Bus (EIB)
and is backward-compatible.
With KNX technology, advanced multiple disciplines and simple solutions can
be implemented to satisfy individual requirements in room and building
automation in a flexible way. The ETS, a vendor-independent tool is available
for commissioning.
KNX can use twisted pair cables, radio frequency (RF) or data transmission
networks in connection with the Internet Protocol for communication between
the devices. KNX has links and interfaces for connection to Ethernet/IP, RF,
lighting control with DALI and building automation and control systems.
Structure
The following figure shows the structure of the KNX network:
● KNX: KNX devices, e.g., third-party KNX
● PX KNX: Automation station PXC001.D or PXC001-E.D and PX KNX
firmware
A KNX network consists of lines. Up to 64 devices can be connected to each
line.
EIB
EIB
EIB
EIB
EIB
EIB
Backbone line
Area 1 Area 3
Backbone
coupler
(1.0.0)
Backbone
coupler
(2.0.0)
Backbone
coupler
(3.0.0)
PX KNX
(0.0.y)
PX KNX
(3.0.y)
PX KNX
(3.1.y)
Line
coupler
(3.1.0)
Line
coupler
(3.2.0)
Line 1
Line 2
L-Switch (Loytec)
Physical repeater
Line