Page 84 - Advanced Course

KNX ADVANCED COURSE

The solar radiation value is measured and expressed in watt per square meter and is
transmitted using a 2 byte Group Object with encoding 9.022, DPT_PowerDensity, which
has a resolution of 0,01 W/m .
2

Figure 64: A typical Group Object in ETS for reading the current solar radiation value

6.2.6 Combined device, Weather station
The term ‘Weather station’ is often used by manufacturers in order to describe the
combination of at least three different measurement options of physical phenomena into
one single device. A weather station includes the same measuring options of separate
physical sensors but has as big advantage the integration of several sensors into one
device.
There are three different types of weather stations; the ‘Cup weather station, the ‘Compact
weather station’ and the ‘Modular weather station’. In the case of ‘Modular weather
station’, several PT1000 sensors can be connected.

Figure 65: Cup weather station, Compact weather station and Modular weather station

Home and Building Management Systems KNX Association
HVAC Control with KNX HVAC_E0813b.doc Page 58/60