This set of functions is used in combination with In / Out Converter definitions in KNX telegram definitions. Some functions provide helper functionality that are only invokable within such LUA conversion functions that are executed by such an item.
To still have the original value available, two more data points are added. They have extended Item IDs with ".IN" and ".OUT".
IN Converter
The corresponding LUA function for IN conversion would look like that:
...
- Source - the original data item
- Destination - the IN data point
OUT Converter
Here an example for an out converter:
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- Source - the OUT data item
- Destination - the original data point