All BACnet objects provide a set of properties which are used to get information from the object, or give information and commands to an object. You can think of an object’s properties as a table with two columns. On the left is the name or identifier for the property, and on the right is the property’s value. Some properties are read only meaning that you can look at the property value, but not change it. Some properties can be changed (written).
The slide shows an example of a temperature sensor, which might be represented as a BACnet Analog Input object. The example shows a few of the properties which might be available with this object, although in practice there would be many more properties than those shown.
The object has a name property (“SPACE TEMP”) and an object type (ANALOG INPUT). The Present_Value property tells us what the temperature sensor is reading at this moment (72.3 degrees). Other properties show us other information about the sensor object, such as whether it appears to be functioning normally, or High and Low Limits for alarming purposes.
