Siemens RDG20 KN Series Basic Documentation page 130

Functions
4
Communication objects
Obj Object name
35 Extended comfort ON
mode status OFF
Indicates the status of Comfort mode extension of manager.
36 External room Temperature
temperature
value
The thermostat receives and works with the room temperature
from an external sensor.
37 Built-in room Temperature
temperature
value
The value of the room temperature measured via built-in sensor or
external sensor is available on bus.
38 Frost alarm No alarm
Alarm
Sends an alarm if the room temperature is below the frost alarm
setting.
39 Heat alarm No alarm
Alarm
Sends an alarm if the room temperature is above the heat alarm
setting.
40 X1: Temperature Temperature
42 X2: Temperature
44 U1: Temperature
Indicate the values of the temperature sensors connected to the
local inputs X1/X2/U1
41 X1: Digital OFF
43 X2: Digital
ON
45 U1: Digital
Indicate the status of the digital inputs (adjusted by
P151/P154/P156) including considering of operating action
46 Heating/Cooling Heating: 1
changeover Cooling: 0
(receive)
Changeover information received via bus.
Default: Current mode before power down.
The same function is also available via local multifunctional input
X1/X2/U1 (P150, P153, P155).
Only one input source must be used, either local input X1/X2/U1or
KNX bus.
47 Heating/Cooling Heating: 1
mode status Cooling: 0
(send)
Sends the current heating or cooling mode of the thermostat.
130 | 180
Function Type/ Flags
length
1.011 CRT
1 bit
9.001 CWU
2 bytes
9.001 CRT
2 bytes
1.005 CRT
1 bit
1.005 CRT
1 bit
9.001 CRT
2 bytes
1.001 CRT
1 bit
1.100 CWU
1 bit
1.100 CRT
1 bit
Obj Object name
48 Application mode HVAC control
mode
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)
49 Dew point alarm No alarm
Alarm
Indicates the status of dew point operation.
50 Enable fan Enable
command value Disable
Set fan mode to Auto (disable) or Manual (enable) by a KNX
control unit. If Manual, the value received on Fan command value
(52) will be used to command the fan speed.
Default: Enable
The last interaction wins – either from the local fan mode button or
via bus.
51 Fan operation Auto
Manual
Indicates the status of the fan mode: Auto (0) or Manual (1).
52 Fan speed value 0...100 %
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 %
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.
Function Type/ Flags
length
20.105 CWU
1 byte
1.005 CWU
1 bit
1.003 CWU
1 bit
1.001 CRT
1 bit
5.001 CWU
1 byte
(1...85)
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