Topology Of The Bus System - HomeMatic HMW-IO-4-FM Installation And Operating Manual

and the control side are separated conforming with
VDE regulations within the sub-distribution. Keep a
minimum spacing of 8 mm between the two types
of wiring.
When connecting the RS485 bus, the A terminals,
the B terminals, the 24 V power supply and the
ground terminal of the modules of a sub-distribution
(max. 127 segments) are to be connected with one
another. A connection diagram with bus system is
provided in the system manual. When using several
modules, a bus termination is required.
Information on the connections is provided in the
respective operating instructions.

5.2 Topology of the bus system

The HMW components should always be mounted
in groups of sub-divisions to provide a better over-
view. The number of sub-divisions that is appropri-
ate depends on the type and size of the project and
is to be defined accordingly.
Installing at least one sub-division on each level is
recommended. Larger buildings may require plan-
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