Commissioning - Basic Documentation - RDF600KN - RDF600KN/S - RDF600KN/VB

Semi-flush mount room thermostats with KNX communications RDF301, RDF301.50, RDF301.50H, RDF600KN, RDF600KN/VB, RDF600KN/S

Product Family
Desigo PX Open
Desigo Open
Product Group
Building automation
Thermostats (temperature controller with sensor)
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Technical Documentation > Basic Documentation
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The room thermostats are delivered with a fixed set of applications.

Select and activate the relevant application during commissioning using one of the following tools:

  • Local DIP switch and HMI

  • Synco ACS

  • ETS

DIP switches

Set the DIP switches before snapping the front panel to the mounting plate, if you want to select an application via DIP switches.

All DIP switches need to be set to "OFF" (remote configuration), if you want to select an application via commissioning tool.

After power is applied, the thermostat resets and all LCD segments flash, indica­ting that the reset was correct. After the reset, which takes about 3 seconds, the thermostat is ready for commissioning by qualified HVAC staff.

If all DIP switches are OFF, the display reads "NONE" to indicate that application commissioning via a tool is required.


Each time the application is changed, the thermostat reloads the factory setting for all control parameters, except for KNX device and zone addresses!

Connect tool

Connect the Synco ACS or ETS tools to the KNX bus cable at any point for commissioning:

ACS and ETS require an interface:

  • Ethernet/LAN KNX interface (e.g. Siemens N148 / N146 / N152)

  • OCI702 USB-KNX interface


An external KNX bus power supply is required if an RDF is connected directly to a tool (ACS or ETS) via KNX interface.

Control parameters

The thermostat's control parameters can be set to ensure optimum performance of the entire system.

The parameters can be adjusted using

  • Local HMI

  • Synco ACS

  • ETS

Commissioning of switching groups for RDF301.50…and RDF600KN/S is only possible with ETS).

The control parameters of the thermostat can be set to ensure optimum performance of the entire system (see section 3.14).

Control sequence

  • The control sequence may need to be set via parameter P01 depending on the application. The factory setting is as follows:

Application Factory setting P01
2-pipe and chilled / heated ceiling 1 = cooling only
4-pipe, chilled ceiling and radiator 4 = heating and cooling

Compressor-based applications

  • When the thermostat is used with a compressor, adjust the minimum output on-time (parameter P48) and OFF-time (parameter P49) for Y11/Y21 to avoid damaging the compressor or shortening its life due to frequent switching.

Calibrate sensor

  • Recalibrate the temperature sensor if the room temperature displayed on the thermostat does not match the room temperature measured (after min. 1 hour of operation). To do this, change parameter P05.

Setpoint and range limitation

  • We recommend to review the setpoints and setpoint ranges (parameters P08…P12) and change them as needed to achieve maximum comfort and save energy.

Programming mode

The programming mode helps identify the thermostat in the KNX network during commissioning.

Press buttons "operating mode" OpModeStbSym and "+" simultaneously for 6 sec to activate programming mode, which is indicated on the display with "PrOg".
Programming mode remains active until thermostat identification is complete.

Assign KNX device address

Assign device address (P81) via HMI, ACS or ETS.

With device address set to 255, the communication is deactivated (no exchange of process data).

Assign KNX group addresses

Use ETS to assign the KNX group addresses of the thermostat's communication objects.

Switching groups
RDF301.50...and RDF600KN/S only

RDF301.50 and RDF301.50H have 2 switching groups with a pair of buttons each, which must be configured via ETS. The switching groups only work in S-Mode.

KNX serial number

Each device has a unique KNX serial number inside the front panel. An additional sticker with the same KNX serial number is enclosed in the packaging box. This sticker is intended for installers for documentation purposes.