Description of communication objects - Basic Documentation - RDF600KN - RDF600KN/S

System time

Time and date

19.001

8 Byte

CWU

System time for display on the room thermostat. See parameter P07 (3 or 4)

Time of day

Time and date

10.001

3 Byte

CWU

Another object for receiving the time of day for display on the room thermostat. See parameter P07 (3 or 4)

Fault information

Alarm Info

219.001

6 Byte

Common alarm output. If an alarm occurs, the alarm number is transmitted

Fault state

Faulty /

normal

1.005

1 bit

Common alarm output. If an alarm occurs, the alarm flag is set

Fault transmission

Enable / disable

1.003

1 bit

CWU

A supervisor alarm system can disable the broadcasting of alarms by the devices. This has no impact on the local display of alarms. After a timeout of 48 hours, the sending of faults will automatically be enabled again.

Room operating mode: Preselection

Auto

Comfort

PreComf.

Economy

Protection

20.102

1 Byte

CWTU

Controls the room operating mode selection of the thermostat via bus.

The command can also be submitted as four 1-bit communication objects (8...11). The last interaction wins – either from local operating mode button or via bus.

Note: The thermostat will transform Pre-Comfort either into Economy or Comfort (selectable via P88).

8
9

Operating mode: Preselection
Auto

Comf

Eco

Prot

Trigger

1.017

1 bit

Switch room operating mode to either Auto, Comfort, Economy or Protection.

The last interaction wins – either from the local operating mode button or via bus.

Room operating mode: Time switch

Comfort Economy PreComf. Protection

20.102

1 Byte

CWU

This information is provided by a central time switch or a supervisor and defines the actual HVAC operating mode.

The command can also be submitted via three 1-bit communication objects (13...15).

Protection has the highest priority and cannot be overridden.

Note: The thermostat will transform Pre-Comfort either into Economy or Comfort (selectable P88).

Time switch

Comfort

Economy

Protection

Trigger

1.017

1 bit

Switch the HVAC mode to either Comfort, Economy or Protection mode.

Room operating mode: State

Comfort Economy Protection

20.102

1 Byte

CRT

Effective room operating mode used by the thermostat (considering time switch, user selection, window contact, etc.) This state information is available via one 8-bit enumeration or three 1-bit communication objects (17...19). Note: The thermostat does not support Pre-Comfort.

Room operating mode:

State Comfort

State Economy

State Protection

OFF

1.002

1 bit

Corresponding communication object sends "True"

Room temperature

Temp. value

9.001

2 Bytes

CRT

The value of the room temperature measured via built-in or external sensor is available via this communication object.

Room temperature: Comfort basic setpoint

Temp. value

9.001

2 Bytes

CWU

If function "Temporary setpoint" is enabled via parameter P69, then after an operating mode change, the setpoint adjustments made by the user and via communication object 23 will be dismissed and the thermostat will be reset to the Comfort basic setpoint.

Note: Setpoints that have been changed via the local HMI may be overwritten during a system startup from a central master controller, e.g.RMB795.

The Comfort basic setpoint is stored in EEPROM (see section 3.3.2). 🡪 The service life of the EEPROM depends on the number of write cycles. Never write this communication object cyclically!

Room temperature: Comfort setpoint

Temp. value

9.001

2 Bytes

CWTU

Communication object used to shift the setpoint used by the thermostat (see section 3.3.2). Same priority as local setpoint shift on the thermostat. The last intervention wins.

Note: The Comfort basic setpoint (object 22) will not be changed.

Current setpoint

Temp. value

9.001

2 Bytes

CRT

Current setpoint, including shift, compensation, etc., used by the thermostat for temperature control

Heating output primary

0…100 %

5.001

8 bit

CRT

Indicates the position of the heating actuator of first stage.
E.g. 2-pipe with electric heater application: Output of heating coil.

Heating output secondary

0…100%

5.001

8 bit

CRT

Indicates the position of the heating actuator of the second stage.
E.g. 2-pipe with electric heater application: Output of the electric heater.

Cooling output primary

0…100%

5.001

8 bit

CRT

Indicates the position of the cooling actuator of the first stage.
E.g. 2-pipe with electric heater application: Output of the cooling coil

Enable electric heating

Enable /

disable

1.003

1 bit

CWU

An electric heater can be disabled with this communication object (e.g. to meet tariff regulations).

The same function is also available via local multifunctional input X1/X2 (parameter P38, P40).

Only one input source must be used, either local input X1/X2 or KNX bus.

Heating / cooling changeover

Heat / Cool

1.100

1 bit

CWU

Changeover information transmitted via bus.

Default: Current mode before power down.

The same function is also available via local multifunctional input X1/X2 (parameter P38, P40).

Only one input source must be used, either local input X1/X2 or KNX bus..

Application mode

HVAC control mode

20.105

8 bit

CWU

0	Auto (default)	Heating and/or cooling
1	Heat	Heating only
2	Morning warmup*	Heating only
3	Cool	Cooling only
5	Precool*	Cooling only
6	OFF	Neither heating nor cooling
8	Emergency heat*	Heating only
9	Fan only	Fan runs at high speed

* Function handled like Heat (1) or Cool (3)

Enable fan command value

Enable

Disable

1.003

1 bit

CWU

Set fan mode to Auto (disable) or Manual (enable) by a KNX control unit. If Manual, the value received on Fan command value (34) will be used to command the fan speed.
Default: Enable

The last interaction wins – either from the local fan mode button or via bus.

Fan operation

Auto

Manual

1.001

1 bit

CRT

Indicates the status of the fan mode: Auto (0) or Manual (1).

Fan command value

0…100%

5.001

8 bit

CWU

The fan can be set to a specified speed by a KNX control unit when manual fan operation is enabled.

Speed	Fan command value (physical KNX value)
1	1...33% (1…85)
2	34…67% (86...170)
3	68…100% (171…255)

Fan speed "0" is not supported by the thermostat and the fan speed will remain unchanged.

Fan output

0…100%

5.001

8 bit

CRT

Indicates the current fan speed as a value 0...100%

Speed	Fan output (physical KNX value)
OFF	0% (0)
1	33% (84 )
2	66% (186)
3	100% (255)

Fan speed 1

Fan speed 2

Fan speed 3

OFF

1.001

1 bit

CRT

Indicate the state of the relay outputs

X1: Temperature

X2: Temperature

Temp. value

9.001

2 Byte

CRT

Indicate the values of the temperature sensors connected to the local inputs X1 / X2

X1: Digital

X2: Digital

OFF

1.001

1 bit

CRT

Indicate the status of the digital inputs (adjusted by parameters P39/P41) including considering of operating action

Outside temperature

Temp. value

9.001

2 Byte

CWU

The outside temperature measured by a KNX sensor can be displayed on the thermostat, if parameter P07 "Additional user information" is set = 2 (outside temperature).

Buttons left ON/OFF

OFF

1.001

1 bit

Buttons right ON/OFF

Switch control: Parameter ON/OFF functions = Top: ON; Bottom: OFF

When pressing the button, the corresponding switching telegram is sent immediately.

Button

top left: ON/OFF

OFF

1.001

1 bit

CT
CWTU 1)

Button

bottom left: ON/OFF

Button

top right: ON/OFF

Button
bottom: Right ON/OFF

Switch control: Parameter ON/OFF functions = 2 "ON/OFF" functions.
When pressing the button, the corresponding switching telegram is sent immediately: ON, OFF or Toggle.

1) If "Toggle" is selected, the communication object becomes output and synchronization input

Buttons left: ON/OFF

Buttons right:

ON/OFF

OFF

1.001

1 bit

Buttons left: Dim up/down

Buttons right: Dim up/down

Darker /

Brighter

1.001

4 bit

On a short operation of the button, a switching telegram is sent, e.g. press left top button: "On" is sent, press left bottom button: "OFF" is sent.

When pressing the buttons longer, a dimming telegram is sent,
e.g. press left top button: "Brighter" is sent, press left bottom button: "Darker" is sent.
On releasing the button, a "Stop" telegram is sent.

Buttons left: Blind step/stop

Buttons right: Blind step/stop

Step / Stop

1.001

1 bit

Buttons left: Blind up/down

Buttons right: Blind up/down

Up / Down

1.001

1 bit

On a short operation of the button, a telegram is sent to adjust the louvers or stop the blinds if moving up or down.
On a long operation of the button, a telegram is sent to raise or lower the blinds (up or down)

Buttons left: Scene

Buttons right: Scene

Scene control

18.001

8 bit

The "Scene (8-bit)" function is used to change the characteristics of a preset scene, i.e. brightness levels and switching states of a group within a scene, without using the ETS.
For scene control, short and long (<1 s / > 3 s) pressing on the buttons are distinguished.
On a short press, a telegram is sent to recall the corresponding scene. On a long press, a telegram is sent to save the corresponding scene.
For each button a different scene number can be configured in ETS.

Specific RDF600KN, RDF600KN/VB objects ¹⁾

20	Window state (RDF600KN, RDF600KN/VB)	Open Closed	1.019 1 bit	CWU
The RDF600KN, RDF600KN/VB is set to Protection if value "1" (open) is received. It switches back to the previous mode when the value is "0" (closed). "Window state" is sent e.g by a KNX switch. It has the same effect as the local window contact X1, X2 (parameter P38, P40). Only one input source must be used, either local input X1/X2 or KNX bus.
45	Presence detector (RDF600KN, RDF600KN/VB)	Unoccupied Occupied	1.019 1 bit	CWU
Standard presence: The thermostat is set to Comfort mode if value "1" (occupied) is received. It switches back to the Economy when the value is "0" (unoccupied). Hotel presence: The thermostat is set to previous mode (operating mode selected by either hotel guests via local HMI or the operating mode sent via bus) if value "1" (occupied) is received. It switches back to the Economy when the value is "0" (unoccupied). "Presence detector" is sent via KNX. It has the same effect as the local presence detector function on X1, X2 (parameter P38, P40). Only one input source must be used, either local input X1/X2 or KNX bus.
46	Room temperature: Economy heating setpoint (RDF600KN, RDF600KN/VB)	Temp. value	9.001 2 Bytes	CWU
Communication object to adjust the Economy heating setpoint used by the thermostat (see section 3.3.2). It will direct change the value of the local parameter Economy setpoint P11. S-Mode object needs to be enabled by setting “Room temp. : Economy setpoints” to “as group object. The Economy setpoint is stored in EEPROM. The service life of the EEPROM depends on the number of write cycles. Never write this communication object cyclically.
47	Room temperature: Economy cooling setpoint (RDF600KN, RDF600KN/VB)	Temp. value	9.001 2 Bytes	CWU
Communication object to adjust the Economy cooling setpoint used by the thermostat (see section 3.3.2). It will direct change the value of the local parameter Economy setpoint P12. S-Mode object needs to be enabled by setting “Room temp. : Economy setpoints” to “as group object. The Economy setpoint is stored in EEPROM. The service life of the EEPROM depends on the number of write cycles. Never write this communication object cyclically.

1) RDF600KN, RDF600KN/VB SW < V1.8 works like RDF301… with the operating mode switchover contact as window contact or presence detector.

Specific RDF301 object

20	Window state (on RDF301…)	Open Closed	1.019 1 bit	CWU
The RDF301 is set to Economy mode if value "1" (open) is received. It switches back to the previous mode when the value is "0" (closed). "Window state" is sent e.g by a KNX switch or a KNX presence detector. It has the same effect as the local operating mode switchover contact X1, X2 (parameter P38, P40). Only one input source must be used, either local input X1/X2 or KNX bus.

Description of communication objects - 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