MDT KNX SCN-RT1UP.01 User manual

MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
State 11/2022 Version 1.1
Technical Manual
MDT Room Temperature Controller
SCN-RT1UP.01
SCN-RT1UPE.01
SCN-TS1UP.01
SCN-RT1APE.01 no longer available
Further Documents:
Datasheet:
https://www.mdt.de/EN_Downloads_Datasheets.html
Assembly and Operation Instructions:
https://www.mdt.de/EN_Downloads_Instructions.html
Solution Proposals for MDT products:
https://www.mdt.de/EN_Downloads_Solutions.html

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
2
2
1 Content
1 Content..................................................................................................................................... 2
2 Overview................................................................................................................................... 4
2.1 Overview devices........................................................................................................................... 4
2.2 Usage & Possible applications....................................................................................................... 4
2.3 Exemplary circuit diagram............................................................................................................. 5
2.4 Structure & Handling..................................................................................................................... 5
2.5 Functions ....................................................................................................................................... 6
2.6 Commissioning .............................................................................................................................. 6
3 Communication objects ............................................................................................................. 7
3.1 Default settings of the communication objects ............................................................................ 7
4 Reference ETS-Parameter .......................................................................................................... 9
4.1 Setup general................................................................................................................................. 9
4.2 Temperature measurement........................................................................................................ 10
4.3 Alarm/Messages.......................................................................................................................... 12
4.4 Controller general........................................................................................................................ 14
4.4.1 Controller type ..................................................................................................................... 14
4.4.2 Operating modes & Setpoints.............................................................................................. 15
4.4.2.1 Operating mode Comfort.............................................................................................. 15
4.4.2.2 Operating mode Night................................................................................................... 16
4.4.2.3 Operating mode Standby .............................................................................................. 16
4.4.2.4 Operating mode Frost/Heat protection ........................................................................ 16
4.4.2.5 Priority of the operating modes.................................................................................... 17
4.4.2.6 Operating mode switchover.......................................................................................... 17
4.4.2.7 Operating mode after reset........................................................................................... 20
4.4.3 Setpoint offset...................................................................................................................... 21
4.4.4 Lock objects.......................................................................................................................... 23
4.4.5 Heating/Cooling request objects.......................................................................................... 24
4.4.6 Guiding ................................................................................................................................. 25
4.4.7 Dead zone............................................................................................................................. 27

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
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4.5 Controller settings....................................................................................................................... 28
4.5.1 Control value ........................................................................................................................ 28
4.5.2 PI control continuous.......................................................................................................... 29
4.5.3 PI control switching (PWM)................................................................................................ 31
4.5.4 2-step control (switching)................................................................................................... 33
4.5.5 Direction of controller.......................................................................................................... 34
4.5.6 Additional level..................................................................................................................... 36
4.5.7 Additional settings for “Heating & Cooling” mode .............................................................. 37
5 Index....................................................................................................................................... 39
5.1 Register of Illustrations ............................................................................................................... 39
5.2 List of tables................................................................................................................................. 40
6 Appendix................................................................................................................................. 41
6.1 Statutory requirements............................................................................................................... 41
6.2 Disposal ....................................................................................................................................... 41
6.3 Assembly...................................................................................................................................... 41
6.4 History ......................................................................................................................................... 41
6.5 Controller types........................................................................................................................... 42
6.5.1 2-Step control..................................................................................................................... 42
6.5.2 PI-control continuous ......................................................................................................... 43
6.5.3 PI-control switching (PWM)................................................................................................ 44

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
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2 Overview
2.1 Overview devices
The manual refers to the following devices, which are in our assortment of room temperature
controller (Order Code respectively printed in bold type):
•SCN-RT1UP.01 Room temperature controller 1-fold, flush mounted
-integrated temperature controller: Two-position, PI, PWM
•SCN-RT1APE.01 Room temperature controller 1-fold, surface mounted, with adjustment knop
-integrated temperature controller: Two-position, PI, PWM
•SCN-RT1UPE.01 Room temperature controller 1-fold, flush mounted, with adjustment knob
-integrated temperature controller: Two-position, PI, PWM
•SCN-TS1UP.01 Room temperature sensor 1-fold
-Sensor for measuring the room temperature, without controller function
2.2 Usage & Possible applications
The room temperature controller has its areas of use at the controlling in home installations and in
the object range.
A lot of different controls can be realized by the room temperature controller. There are three
integrated controllers, which can be adjusted to the present system. The three controllers can
control as well heating systems as cooling systems. There are setting options for up to 4 different
operating modes. Additional levels, blocking functions, settings of external sensors and guiding can
also be adjusted.
An exception is the SCN-TS1UP.01. This is only a sensor for measuring the temperature. There are no
integrated temperature controllers at this device. The temperature sensor has its areas of use at the
measuring of temperatures for other controllers.

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
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2.3 Exemplary circuit diagram
Figure 1: Exemplary circuit diagram
2.4 Structure & Handling
The temperature controller is available in three different versions, as a flush-mounted device, for
surface mounting and for mounting in control cabinets or on DIN rails. The devices each have a bus
connection terminal and a programming button, as well as a programming LED.
Figure 2: SCN-RT1UP.01 Figure 3: SCN-RT1APE.01 Figure 4: SCN-RT1UPD.01
The room temperature sensor, SCN-TS1UP.01, is for flush-mounting. It contains also of a bus-
connection, a programming button and a programming LED.
Housing shape corresponds to that of the SCN-RT1UP.01.

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
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2.5 Functions
The controller has 5 different setting ranges, which are subdivided as follows:
•Setup general
General settings can be made at this menu and the used device can be chosen.
•Temperature measurement
The settings for the measurement for the temperature can be made at this menu. Settings
for the min/max values and the sensor configuration are available at this parameter.
All sensors contain of an in-plant balance.
•Alarm/Messages
Alarms and messages can be adjusted at this menu. This alarms and messages report when
the temperature falls below an adjusted value or exceed an adjusted value.
•Controller general
At this menu, the desired function (heating, cooling or heating & cooling) can be assigned
and general settings, like setpoints, can be adjusted.
•Controller settings
This menu appears as soon as the controller has got a function assigned. Integrated
controllers can be chosen at this menu and the chosen controller can be parameterized
further.
The temperature sensor SCN-TS1UP.01 only has "Setup general", "Temperature measurement" and
"Alarm/Messages".
2.6 Commissioning
After wiring the allocation of the physical address and the parameterization of every channel follow:
(1) Connect the interface with the bus, e.g. MDT USB interface
(2) Switch-on bus voltage
(3) Press the programming button at the device (red programming LED lights)
(4) Loading of the physical address out of the ETS-Software by using the interface (red LED turns
off as soon as the process is successfully completed)
(5) Loading of the application, with requested configuration
(6) If the device is enabled, you can test the requested functions (also possible by using the ETS-
Software)

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
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3 Communication objects
3.1 Default settings of the communication objects
The following chart shows the default settings for the communication objects:
Default settings
Nr.
Name
Object Function
Length
C
R
W
T
U
0
Actual temperature value
Transmit temperature value
2 Byte
X
X
X
1
Higher message value
Send message
1 Bit
X
X
X
2
Lower message value
Send message
1 Bit
X
X
X
3
Frost alarm
Send alarm
1 Bit
X
X
X
4
Heat alarm
Send alarm
1 Bit
X
X
X
5
External sensor
Read external sensor
2 Byte
X
X
6
Setpoint comfort
Set setpoint
2 Byte
X
X
X
X
7
Manual setpoint value offset
Reduction/Increase
2 Byte
X
X
8
Control value heating
Send control value
1 Bit
X
X
X
8
Control value heating
Send control value
1 Byte
X
X
X
8
Control value heating/cooling
Send control value
1 Bit
X
X
X
8
Control value heating/cooling
Send control value
1 Byte
X
X
X
9
Control value additional heating
Send control value
1 Bit
X
X
X
10
Control value cooling
Send control value
1 Bit
X
X
X
10
Control value cooling
Send control value
1 Byte
X
X
X
10
Status Cooling/Heating
0= Cooling, 1=Heating
1 Bit
X
X
X
11
Mode comfort
Switch mode
1 Bit
X
X
X
12
Mode night
Switch mode
1 Bit
X
X
X
13
Mode frost/heat protection
Switch mode
1 Bit
X
X
X
14
Heating disable object
Disable heating
1 Bit
X
X
15
Cooling disable object
Disable cooling
1 Bit
X
X
17
Heating request
Send request
1 Bit
X
X
X
18
Cooling request
Send request
1 Bit
X
X
X
19
Heating/Cooling switchover
0= Cooling, 1=Heating
1 Bit
X
X
X
20
Guiding value
Setpoint adjustment
2 Byte
X
X
X
21
Max memory value
Read memory
2 Byte
X
X
X
X
22
Min memory value
Read memory
2 Byte
X
X
X
X
23
Min/Max memory reset
Reset memory
1 Bit
X
X
X
24
Reset setpoint value
Parameter read in
1 Bit
X
X
25
DPT_HVAC Status
Send controller status
1 Byte
X
X
X
28
Error external Sensor
Error message
1 Bit
X
X
X
29
Actual setpoint
Send setpoint
2 Byte
X
X
X

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
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30
DPT_RHCC
Send controller status
2 Byte
X
X
X
31
Mode selection
Select mode
1 Byte
X
X
X
32
Manual setpoint value offset
Increase / Reduction (1=+/0=-)
1 Bit
X
X
Table 1: Communication objects –Default settings
You can see the default values for the communication objects from the upper chart. According to
requirements the priority of the communication objects as well as the flags can be adjusted by the
user. The flags allocate the function of the objects in the programming thereby stands C for
communication, R for Read, W for write, T for transmit and U for update.

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
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4 Reference ETS-Parameter
4.1 Setup general
The following settings are available:
Figure 5: General settings
The chart shows the dynamic range of the general settings:
ETS-text
Dynamic range
[default value]
Comment
Startup delaytime
0 –60 s
[0]
Time that elapses between bus
voltage return and functional start of
the device.
Table 2: General settings
Startup delaytime
This time defines when the unit "boots up" after a restart (reset, reprogramming, bus voltage return).
This can be important if, for example, a bus reset is carried out. If there are many units on a line, all
units would start at the same time and load the bus. With a variable time, the units can thus start
differently.
The SCN-TS1UP.01 is a pure temperature sensor, which does not contain of any controller functions.
Therefore, only the menus 4.2 Temperature measurement and 4.3 Alarm/Messages are shown and
can be configured.

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
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4.2 Temperature measurement
The following settings are available at the ETS-Software:
Figure 6: Settings –Temperature measurement
The following table shows the available settings:
ETS-text
Dynamic range
[default value]
Comment
Send actual value after
change of
Disable, 0,1K –2,0K
Sending condition for the actual
temperature value.
Send actual temperature
cyclically
Disable, 1 min –60 min
Activation of the cyclic sending of
the temperature value.
Send min/max value
▪Disable
▪Send enable
Activation of the sending of
min/max values.
Internal sensor correction
value (value*0,1K)
-50 …50
[0]
Correction of the internal sensor.
Internal/external sensor
▪100% intern
▪90% intern/ 10% extern
▪80 % intern/ 20% extern
▪…
▪100% extern
Adjustment of the balance
between internal and external
sensor.
Table 3: Settings –Temperature measurement
Send actual value after change of
This function sets when the current temperature value shall be sent. By choosing the setting
“disable”, no value will be sent at all.
Send actual temperature cyclically
You can activate this function by choosing a time. Now, the room temperature controller sends the
current temperature periodically after the adjusted time. This function is independent from the
function “Send actual value after change of”. So the temperature controller will send its current
value also if there is no change of it.
Internal sensor correction value (value*0,1K)
You can correct the measured temperature value by this setting. By choosing a negative value for this
parameter, the measured value will be lowered and by choosing a positive value, the measured value
will be lifted. The value is multiplied by 0,1K, so the current value can be lowered or lifted up to 5K.
This setting is useful, when the sensor was built at an unfavourable location, e.g. becoming draft or
next to a window. When this function is activated, the temperature controller will also send the
corrected values.
All sensors are matched in-plant to 0,1K.

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
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The chart shows the relevant communication object for the temperature value:
Number
Name
Length
Usage
0
Actual temperature value
2 Byte
Sends the current temperature value
Table 4: Communication object –Temperature value
Send min/max value
This function activates the sending and saving of the min/max values. When the function is activated
by “Send enable”, three communication objects will be shown. Two objects for the Min and the Max
value and one for the reset of the min/max values.
The chart shows the relevant communication objects for this parameter:
Number
Name
Length
Usage
21
Max memory value
2 Byte
Sends and saves the maximal temperature value
22
Min memory value
2 Byte
Sends and saves the minimal temperature value
23
Min/Max memory reset
1 Bit
Resets the min/max values
Table 5: Communication objects –Min/Max values
Internal/external sensor
This setting sets the balance between an internal and an external sensor. The setting 100% intern
deactivates any external sensor. By choosing any other setting, an external sensor will be activated.
So, also communication objects for the external are shown. A balance of 100% extern deactivates the
internal sensor and the temperature controller will only note values of the external sensor.
The communication objects for an activated external sensor are shown at the chart:
Number
Name
Length
Usage
5
External sensor
2 Byte
Sends the measured temperature value of the
external sensor
28
Error external sensor
1 Bit
Sends an error when the external sensor sends
no value for more than 30min
Table 6: Communication objects –External sensor

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
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4.3 Alarm/Messages
The following settings are available:
Figure 7: Settings –Alarm/Messages
The table shows the available settings:
ETS-text
Dynamic range
[default value]
Comment
Alarm
▪not active
▪active
Activation of the alarm function.
Frost alarm if value <
3°C –10°C
[7°C]
Dynamic range of the frost alarm.
Adjustment possible if alarm is
activated.
Heat alarm if value >
25°C –40°C
[35°C]
Dynamic range of the heat alarm.
Adjustment possible if alarm is
activated.
Messages
▪not active
▪active
Activation of the message function.
Message if value >
18°C –40°C
[26°C]
Dynamic range of the upper message.
Adjustment possible if messages are
activated.
Message if value <
1°C –25°C
[13°C]
Dynamic range of the lower message.
Adjustment possible if messages are
activated.
Table 7: Settings –Alarm/Messages

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
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If the "Alarms" function is activated, two alarm classifications can be configured. One is the alarm for
the lower response value, the "Frost alarm", and the other is for the upper response value, the "Heat
alarm". The two alarms each have a separate communication object, which can also be linked
individually. The communication objects are each 1-bit objects.
The following communication objects are available:
Number
Name
Length
Usage
3
Frost alarm
1 Bit
Sending a frost alarm
4
Heat alarm
1 Bit
Sending a heat alarm
Table 8: Communication objects –Alarms
The “Messages”function is almost identical to the “Alarm”function, but less in its priority. There are
two messages available, when the message function was activated. These two messages can be
parameterized separately. The dynamic range of the message function is much bigger than the one
of the alarm functions. So, it is also possible, to realize running turn over. Both messages have an
own communication object of the size 1 bit.
The following communication objects are available:
Number
Name
Length
Usage
1
Higher message value
1 Bit
Sends a message when the upper message limit is
reached
2
Below message value
1 Bit
Sends a message when the lower message limit is
reached
Table 9: Communication objects –Messages

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
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4.4 Controller general
4.4.1 Controller type
The following picture shows the available settings:
Figure 8: Settings –Controller type
The table shows the available settings:
ETS-text
Dynamic range
[default value]
Comment
Controller type
▪Controller off
▪Heating
▪Cooling
▪Heating and Cooling
Adjustment of the controller type
The further settings depend to the
adjusted controller type.
Table 10: Settings –Controller type
The controller type defines the function of the room temperature controller. Target of the control is
to keep an adjusted temperature constant. There are a lot of settings, which can help to achieve this
aim. The settings depend to the adjusted controller type.
By choosing the setting “Controller off”, no further settings are possible.

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
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4.4.2 Operating modes & Setpoints
The following picture shows the available settings:
Figure 9: Settings –Operating modes & setpoints
The table shows the available settings:
ETS-text
Dynamic range
[default value]
Comment
Basis comfort setpoint
18,0 °C –25,0 °C
[21,0 °C]
The basis comfort setpoint is the
reference point of the control.
Night reduction/increase
0 K –10,0 K
[2,0 K]
Reduction (for "Heating") or increase
(for "Cooling") of the temperature
when the operating mode “Standby”
is selected. Is indicated relative to the
basic comfort value.
Standby
reduction/increase
0 K –10,0 K
[3,0 K]
Reduction (for "Heating") or increase
(for "Cooling") of the temperature
when the operating mode “Night” is
selected. Is indicated relative to the
basic comfort value.
Setpoint frost protection
3 °C –12 °C
[7 °C]
Setpoint of the frost protection mode,
is indicated as an absolute value.
Visible when "Heating" is active.
Setpoint heat protection
24 °C –40 °C
[35 °C]
Setpoint of the heat protection mode,
is Indicated as an absolute value.
Visible when "Cooling" is active.
Table 11: Settings –Operating modes & setpoints
4.4.2.1 Operating mode Comfort
The "Comfort" operating mode is the reference operating mode of the controller. The values in the
operating modes "Night" and "Standby" are based on this. The "Comfort" operating mode should be
activated when the room is in use. The basic comfort value is configured as the setpoint.
If the controller type is set to "Heating & Cooling", the basic comfort value applies to the heating
operation. In cooling mode, the value of the dead zone between "Heating" and "Cooling" is added.

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The following communication object is available for this:
Number
Name
Length
Usage
11
Mode comfort
1 Bit
Activation of the operating mode Comfort
Table 12: Communication object –Operating mode Comfort
4.4.2.2 Operating mode Night
The operating mode “Night”shall cause a significant decrement of the temperature, for example at
night or at the weekend. The reduction can be programmed freely and refers to the basic comfort
setpoint. If you have programmed a reduction of 5K and a basic comfort setpoint of 21°C, the
setpoint for the “Night”mode will be 16°C.
The following communication object is available for this:
Number
Name
Length
Usage
12
Mode night
1 Bit
Activation of the operating mode Night
Table 13: Communication object –Operating mode Night
4.4.2.3 Operating mode Standby
The "Standby" operating mode is used when no one is using the room. It should cause a slight
reduction/increase of the temperature. This value should be set significantly lower than the value for
the "Night" operating mode to enable a faster reheating/cooling of the room. The value is freely
configurable and refers to the basic comfort value. So if a setback of 2K has been set in the
parameters and a basic comfort value of 21°C has been set, the setpoint for the 'Standby' operating
mode is 19°C. In cooling mode, there is a corresponding increase in the value.
The "Standby" operating mode is then activated as soon as all other operating modes are deactivated.
Thus, this operating mode also has no communication object.
4.4.2.4 Operating mode Frost/Heat protection
The "Frost protection" operating mode is activated as soon as the "Heating" function has been
assigned to the controller, the "Heat protection" operating mode is activated as soon as the
"Cooling" function has been assigned to the controller. If the "Heating & Cooling" function is assigned
to the controller, a combined operating mode called "Frost/Heat Protection" is activated.
The "Frost/Heat protection" operating mode causes heating or cooling to be switched on
automatically if the temperature falls below or exceeds the configured temperature. The
temperature is set as an absolute value. If, for example, the temperature must not fall below a
certain value during a longer absence, the "Frost protection" operating mode should be activated.
The following communication objects are available:
Number
Name
Length
Usage
13
Mode frost protection
1 Bit
Activation of the operating mode frost
protection
13
Mode heat protection
1 Bit
Activation of the operating mode heat
protection
13
Mode frost/heat protection
1 Bit
Activation of the operating mode frost/heat
protection
Table 14: Communication objects –Operating mode Frost/Heat protection

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
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4.4.2.5 Priority of the operating modes
The table shows the available settings:
Figure 10: Settings –Priority of the operating modes
The chart shows the dynamic range of the priority of the operating modes:
ETS-text
Dynamic range
[default value]
Comment
Priority
▪Frost/Comfort/Night/Standby
▪Frost/Night/Comfort/Standby
Setting the priority order.
Table 15: Settings –Priority of the operating modes
The priority setting of the operating modes can be used to set which operating mode is switched on
with priority if several operating modes have been selected. If, for example, "Comfort" and "Night"
are switched on simultaneously with the priority "Frost/Comfort/Night/Standby", the controller
remains in "Comfort" mode until this is switched off. The controller then automatically switches to
"Night" mode.
4.4.2.6 Operating mode switchover
There are 2 possibilities for the switchover of the operating modes: On the one hand the operating
modes can be switched on by their 1 Bit communication object and on the other hand by a 1 Byte
object (from DB V1.2).
The selection of the operating modes by their 1 Bit communication object occurs via a direct
selection of their individual communication object. With consideration of the adjusted priority, the
operating mode, which was selected via the 1 Bit communication object, is switched on or off. When
all operating modes are switched off, the controller changes to the standby mode.
Example (priority to Frost/Comfort/Night/Standby”).
Operating mode
adjusted operating mode
Comfort
Night
Frost-/ Heat protection
1
0
0
Comfort
0
1
0
Night
0
0
1
Frost-/Heat protection
0
0
0
Standby
1
0
1
Frost-/Heat protection
1
1
0
Comfort
Table 16: Example switchover of the operating modes via 1 Bit

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The switchover of the operating modes via 1 Byte occurs by only one object, with the size of 1 Byte,
the DPT_HVAC Mode 20.102 of KNX-specification. Additionally, there are 2 objects for the
visualization available, the 1 Byte object “DPT_HVAC Status” and the 2 Byte object “DPT_RHCC
Status”. For the switchover of the operating modes, a Hex-value is sent to the object “mode
selection”. The object evaluates the received value and switches the belonging operating mode on
and the active operating mode off. If all operating modes are switched off (Hex-value=0), the
operating mode standby will be switched on.
The set hex values for the individual operating modes can be taken from the following table:
Operating mode (HVAC Mode)
Hex-Value
Comfort
0x01
Standby
0x02
Night
0x03
Frost/Heat protection
0x04
Table 17: Hex-Values for operating modes (from Version 1.2)
The following example shall clarify how the controller handles received Hex-values and switches
operating modes on or off. The chart is to read from the top to the down.
Example (priority to “Frost/Comfort/Night/Standby”):
received Hex-value
Handling
adjusted operating
mode
0x01
Comfort=1
Comfort
0x03
Comfort=0
Night=1
Night
0x02
Night=0
Standby=1
Standby
0x04
Frost-/Heat protection=1
Standby=0
Frost-/Heat protection
Table 18: Example operating mode switchover via 1 Byte (from Version 1.2)
The DPT HVAC Status communication, DPT_HVAC Status (without number) of KNX-specification,
object sends the hex value for the adjusted operating mode. If several statements apply, the hex
values are added and the status symbol then displays the added hex value. The hex values can then
be read out by a visualisation.
The following chart shows the hex values for the single messages:
Bit
DPT HVAC Status
Hex-Value
0
Comfort
1=Comfort
0x01
1
Standby
1=Standby
0x02
2
Night
1=Night
0x04
3
Frost-/Heat protection
1= Frost-/Heat protection
0x08
4
5
Heating/Cooling
0=Cooling/1=Heating
0x20
6
7
Frost alarm
1=Frost alarm
0x80
Table 19: Hex-Values DPT HVAC Status (from Version 1.2)

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
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The object is used exclusively for status/diagnostic purposes. Furthermore, it is well suited for
visualisation purposes. To visualise the object, it is easiest to evaluate the object bit by bit.
The object outputs the following values, for example:
0x21 = Controller in Heating operation with activated Comfort mode
0x01 = Controller in Cooling operation with activated Comfort mode
0x24 = Controller in Heating operation with activated Night mode
The DPT RHCC Status object is an additional 2 Byte status object with additional status messages. If
more than one testify is valid, also here the values will be added in the same way as at the HVAC
object.
The following chart shows the hex values for the single messages:
Bit
DPT RHCC Status
Hex-Value
0
Error Sensor
1=Error
0x01
8
Heating/Cooling
0=Cooling/1=Heating
0x100
13
Frost alarm
1=Frost alarm
0x2000
14
Heat alarm
1=Heat alarm
0x4000
Table 20: Hex-Values DPT RHCC Status (from Version 1.2)
The Controller reacts always to the value, which was sent last. If you switched the operating mode
last via 1 Bit, the controller would react to the switchover by 1 Bit. If you switched the operating
mode last via 1 Byte, the controller would react to the switchover by 1 Byte.
The communication objects for the mode selection are shown at the following chart. The first 3
communication objects are for the 1 Bit switchover, the last 3 objects are for the switchover via 1
Byte:
Number
Name
Length
Usage
11
Mode Comfort
1 Bit
Activation of the mode comfort
12
Mode Night
1 Bit
Activation of the mode night
13
Mode Frost/Heat protection
1 Bit
Activation of the mode Frost/ Heat protection
25
DPT_HVAC Status*
1 Byte
Visualization of the chosen operating mode
30
DPT_RHCC Status*
2 Byte
Visualization measuring/ status of the
controller
31
mode selection*
1 Byte
Selection of the operating mode
Table 21: Communication objects –Operating mode switchover
* from DB Version 1.2

Technical Manual
Room Temperature Controller [SCN-RT1xPx.01]
MDT technologies GmbH • 51766 Engelskirchen • Papiermühle 1 • Germany
Phone: [phone] • [e-mail] • www.mdt.de
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4.4.2.7 Operating mode after reset
The following picture shows the available settings:
Figure 11: Settings –Operating mode after reset
The table shows the available settings:
ETS-text
Dynamic range
[default value]
Comment
Operating mode after
reset
▪Comfort with parameterized
setpoint
▪Standby with parameterized
setpoint
▪Hold old state and setpoint
Setting which operating mode is
to be activated after a bus
voltage return.
Table 22: Settings –Operating mode after reset
This parameter defines the operating mode, which shall be adjusted after a bus power return. The
controller can start with the “Comfort”mode or with the “Standby”mode. In both cases, the
parameterized set point will be restored. By using setting “Hold old state and set point”, the
controller restores the old operating mode and the set point, which was active before the reset. It
must be pointed out, that the controller has no settings in its memory in case of an initial operation.