Topology Of The Bus System - HomeMatic RS485 Installationsanleitung

have to be used. Using interior telecommunications
wiring or comparable control wiring is recommended.
Make sure, however, that the wires of the load 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
(1.3), the B terminals (1.7), the 24 V power supply and
the common terminals (ground) (1.8) of the modules
on a sub-distribution board (127 components maxi-
mum) must be connected to one another.
A connection diagram with bus system is provided in
the system manual. If the RS485 bus is used, a bus
terminator is required, which can be connected to the
surge protector, if one is not already available in the
bus in question.

5.2 Topology of the bus system

In order to retain a clear overview, the HMW compo-
nents should always be installed on sub-distribution
boards in groups. The appropriate number of
sub-distribution boards will depend on the type and
scope of the project being carried out and must be
determined on an individual basis.
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