890370_0•en•01.06.2009 We reserve the right to carry out improvements
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4.3 Planning the network
structure
All components of the control communicate with each other via an RS 485
bus system. The structure of the network resembles a line structure. Careful
planning of the network prior to installation saves you elaborate and time-
consuming adjustment work.
= Components
= Terminating resistance
✔
✘
✘
Fig. 6 Bus topology: Do not use start or ring circuits.
Please observe the following items regarding the network structure:
NOTE The control panel should constitute the starting point of the network and the
weather station the terminating point since these two units are equipped with
a factory-activated terminating resistor of 120Ω.
If this arrangement is not possible and a switch actuator or the humidity/tem-
perature sensor constitutes the terminating or starting point of the network,
the starting and terminating point of the bus lines must be concluded with
120Ω. The accessory box includes a suitable bus terminal with an integrated
terminating resistor as well as a single resistor as a spare part.
If the weather station or the control panel is not positioned at the starting
or terminating point of the line, the installed terminating resistor must be re-
moved. On the weather station, it is removed by taking off or switching the
connector (see Fig. 22 on page 43) and on the control panel by using a bus
terminal without an integrated resistor.
The X6(A) and X6(B) bus terminals are used to connect the bus lines. Note
the colour coding of the terminals: do not switch the terminals by mistake.
A maximum of 200 actuators, 3 weather stations and 2 humidity/temperature
sensors may be used in one system.
In case of system malfunction, check whether the bus line has been flaw-
lessly terminated with 120 Ω at both ends.
Also check whether the bus line is correctly connected. The correct polarity
must be adhered to (red and black).
NOTE Observe also Fig. 7 regarding the network arrangement.
Installation
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