Technical data

Obj
Object name
Function
Type/ length
Flags
27
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.
28
Cooling output
secondary
0…100%
5.001
8 bit
CRT
Indicates the position of the cooling actuator of the second stage.
E.g. 2-stage changeover application: Output of the second cooling
stage.
29
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/D1 (parameter P38, P40, P42).
Only one input source must be used, either local input X1/X2/D1or
KNX bus.
30
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/D1 (parameter P38, P40, P42).
Only one input source must be used, either local input X1/X2/D1or
KNX bus..
31
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)
32
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.
Obj
Object name
Function
Type/ length
Flags
33
Fan operation
Auto
Manual
1.001
1 bit
CRT
Indicates the status of the fan mode: Auto (0) or Manual (1).
34
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.
35
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)
36
37
38
Fan speed 1
Fan speed 2
Fan speed 3
ON
OFF
1.001
1 bit
CRT
Indicate the state of the relay outputs
39
40
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
41
42
43
X1: Digital
X2: Digital
D1: Digital
ON
OFF
1.001
1 bit
CRT
Indicate the status of the digital inputs (adjusted by parameters
P39/P41/P43) including considering of operating action
44
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).
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Siemens RDG100KN, RDG160KN Basic documentation CE1P3191en
Building Technologies Functions 2014-05-23