Siemens RDG20 KN Series - Page 133

Functions
Communication objects (RDG2..KN)
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Obj
Object name
Function
Type/
length
Flags
35
Extended comfort
mode status
ON
OFF
1.011
1 bit
CRT
Indicates the status of Comfort mode extension of manager.
36
External room
temperature
value
Temperature
9.001
2 bytes
CWU
The thermostat receives and works with the room temperature
from an external sensor.
37
Built-in room
temperature
value
Temperature
9.001
2 bytes
CRT
The value of the room temperature measured via built-in sensor or
external sensor is available on bus.
38
Frost alarm
No alarm
Alarm
1.005
1 bit
CRT
Sends an alarm if the room temperature is below the frost alarm
setting.
39
Heat alarm
No alarm
Alarm
1.005
1 bit
CRT
Sends an alarm if the room temperature is above the heat alarm
setting.
40
42
44
X1: Temperature
X2: Temperature
U1: Temperature
Temperature
9.001
2 bytes
CRT
Indicate the values of the temperature sensors connected to the
local inputs X1/X2/U1
41
43
45
X1: Digital
X2: Digital
U1: Digital
OFF
ON
1.001
1 bit
CRT
Indicate the status of the digital inputs (adjusted by
P151/P154/P156) including considering of operating action
46
Heating/Cooling
changeover
(receive)
Heating: 1
Cooling: 0
1.100
1 bit
CWU
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
mode status
(send)
Heating: 1
Cooling: 0
1.100
1 bit
CRT
Sends the current heating or cooling mode of the thermostat.
Obj
Object name
Function
Type/
length
Flags
48
Application mode
HVAC control
mode
20.105
1 byte
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)
49
Dew point alarm
No alarm
Alarm
1.005
1 bit
CWU
Indicates the status of dew point operation.
50
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
(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
1.001
1 bit
CRT
Indicates the status of the fan mode: Auto (0) or Manual (1).
52
Fan speed value
0...100 %
5.001
1 byte
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.