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Building Technologies
Boiler Sequence Controller RMK770
CE1P3132en
HVAC Products
14 Communication
23.04.2009
14 Communication
A detailed description of communication is given in Basic Documentation “Communica-
tion via KNX bus” (P3127). In the following, the most important settings required for
commissioning a multiboiler plant are described.
Communication is activated when the following conditions are satisfied:
•
The device address has been entered (every bus user requires an individual device
address)
•
Bus power supply is available
•
The bus device is not in commissioning mode
Exchange of data required for heating and ventilation plant takes place in LTE mode
(Easy Mode). This mode facilitates straightforward data exchange without requiring a
major engineering effort.
Similar data are exchanged within zones. To allow for communication, it is therefore
sufficient to create a common zone.
Plant assignment of the devices is of no importance. The plants can be can be assigned
to the same RMK770 controller or to different KNX devices interconnected via bus.
14.1 Basic settings
Before the zone allocations for the exchange of process data can be made, the device
address must be set.
Main menu > Commissioning > Communication > Basic settings
Operating line
Range Factory
setting
Device address
1…253 (1…255)
255
Decentral bus power supply
Off / On
On
Clock time operation
Autonomous / Slave /
Master
Autonomous
Remote setting clock slave
Yes / No
Yes
Remote reset of fault
Yes / No
No
The settings made here are also displayed under:
Main menu
>
Device information > Communication > Basic settings
Every bus user must have its individual device address. Device addresses 254 and 255
are reserved for special functions. With device address 255, communication is deacti-
vated (no exchange of process data).
For small plants (maximum 8 devices), decentral power supply is adequate. This
represents the factory setting). For detailed information, refer to Data Sheet “KNX bus”
(N3127) and Basic Documentation “KNX communication” (P3127).
When selecting “Autonomous”, the device does not receive or send the time of day. If
the system shall use a common time of day, one of the devices is to be defined as the
clock time master and the others as slaves.
Function “Remote setting clock slave” enables the user to set the time of day and the
date on a clock slave.
The new values are sent to the clock master via KNX bus. The master then delivers the
new time of day to all bus users. This means that for the user, operation is the same as
on the clock master.
Activating
communication
Process data exchange
Communication
Device address
Decentral bus power
supply
Clock time operation
Remote setting
clock slave
