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Building Technologies Basic documentation: Communication via the KNX bus CE1P3127en
HVAC Products Engineering notes 30.08.2007
2.3 Bus topologies
Permissible bus topologies are: tree, line and star topologies. These topologies can
be mixed as needed. However, ring topologies are not permissible.
The tree topology is advantageous when creating a large network.
Tree topology (with stub lines) Line topology (with loops)
N2 N2
N1 N3 N4 N1 N4
N5
N6
N7 N3
KNX TP1KNX TP1
3127Z02
N1 .. N7 Bus devices
CE+
CE-
CE+
CE-
CE+ CE-
Device with
screw terminals
T-branch with
bus terminal
Device with
spring cage terminals
3127Z06en
CE+ CE- CE-CE+
N1 N2 N5 N6
N7N3
N4 N8
CE+ CE-
N1 .. N8 Bus devices
Advantage:
Tree topology
Branching and
connection variants
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