Order No. 2104 ..
X
X
X
X
0
-
1
Comfort
mode
Table 5: Status of the communication objects and the resulting operating mode
X: Status irrelevant
-: Not possible
*: Dependent on the last active operating mode.
i
When changing over the operating mode, the objects "Comfort mode", "Standby mode",
"Night mode" and "Frost/heat protection" are updated by the controller and can be read out
when the appropriate Read flags are set. If the "Transmit" flag has been set for these
objects the current values will, in addition, be automatically transmitted to the bus when
they are changed. After bus voltage recovery or after initialisation of the controller, the
object which corresponds to the selected operating mode will be updated and its value
actively transmitted to the bus if the "Transmit" flag has been set.
i
In parameterisation of a presence button: the presence object will be active ("1") for the
period of an comfort extension. The presence object will be automatically deleted ("0") if the
comfort extension is stopped after the extension time has elapsed, or if the operating mode
has been changed by a higher-priority operation through the change-over objects. The
controller therefore automatically resets the status of the presence button when an object is
received via the operating mode objects.
-
Operating mode change-over through "value (1 byte)"
There is a common 1-byte change-over object for all operating modes. During the running
time, the operating mode can be changed over through this value object immediately after
the receipt of only one telegram. In this connection, the value received will set the operating
mode. In addition, a second 1-byte object is available which, by forced control and through
higher level, can set an operating mode, irrespective of any other change-over options.
According to the KNX specification, both 1-byte objects have been implemented.
Taking account of the priority, a specific hierarchy will result from the operating mode
change-over by the objects, a distinction being made between presence detection by the
presence button (Figure 26) or the presence detector (Figure 26). In addition, the status of
the window in the room can be evaluated using the "Window status" object, meaning that,
when the window is open, the controller can switch to Frost/heat protection mode,
irrespective of the set operating mode, in order to save energy .
Table 6 also shows the status of the communication objects and the resulting operating
mode.
Page 81 of 171
Software "KNX CO2 sensor"
Functional description
