For a KNX blinds function two group addresses are required. The first group address groups the move up/down objects. Move up/down objects have a data length of 1 bit. The second group address groups the step/stop objects. Step/stop objects also have a data length of 1 bit.
This requires an additional group address that groups the absolute position % objects. These objects have a data length of 8 bit.
+ Wind Alarm
This requires an additional group address that groups the wind speed objects. These objects have a data length of 16 bit. The wind alarm device sends the wind speed information on the bus. The blinds actuator receiving this information compares it with an internal treshhold wind speed (set via a parameter), if the outside wind speed reaches the (internal) treshold then the actuator will move the blinds up in oder to secure it.