EbV Product documentation THETA NORM/UNIT
9-1
9 Data bus / Bus Communication / Room controllers
9.1 The data bus system
Function: The controllers THETA can be connected by a data bus. This enables
• controlling further heating circuits by adding up to four additional standard units
• connecting room sensors and remote units to the standard units and assigning
them to heating circuits
• cascading multiple heat generators with built-in standard unit (not implemented at
the moment).
The maximum possible expansion of the bus system is shown in the following image.
9.1.1 Data bus addresses
Function: The individual devices in the buss system are assigned precise addresses. This is
set in the corresponding parameter in the parameter tree "BUS". The assignment
occurs according to the following table.
NOTE! Make sure that one controller is assigned bus address 10.
NOTE! Bus adresses may only be assigned once.
Address Device type Assignment
10 Control unit Standard unit 1 as central controller
20, 30, 40, 50 Control unit Standard unit 2 to 5 as add-on controllers for extension of
heating circuits or cascade
11,...,19 Extra units Assigned to controller 1 or general
21,...,29 Extra units Assigned to controller 2
31,...,39 Extra units Assigned to controller 3
41,...,49 Extra units Assigned to controller 4
51,...,59 Extra units Assigned to controller 5
Operation:
Note on operation Key / parametertree Parameter
Setting bus address DATA BUS PARAMETER 01
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