MDT SCN-RT1UP.01 Technical Manual page 18

Technical Manual
Room Temperature Controller
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:
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
received Hex-value
0x01
0x03
0x02
0x04
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
0 Comfort
1 Standby
2 Night
3 Frost-/Heat protection
4
5 Heating/Cooling
6
7 Frost alarm
Table 19: Hex-Values DPT HVAC Status (from Version 1.2)
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[SCN-RT1xPx.01]
Operating mode (HVAC Mode)
Comfort
Standby
Night
Frost/Heat protection
Table 17: Hex-Values for operating modes (from Version 1.2)
"Frost/Comfort/Night/Standby"):
Handling
Comfort=1
Comfort=0
Standby=1
Frost-/Heat protection=1
Standby=0
Hex-Value
0x01
0x02
0x03
0x04
Night=1
Night=0
1=Comfort
1=Standby
1=Night
1= Frost-/Heat protection
0=Cooling/1=Heating
1=Frost alarm
adjusted operating
mode
Comfort
Night
Standby
Frost-/Heat protection
Hex-Value
0x01
0x02
0x04
0x08
0x20
0x80