﻿It can be defined here when the gateway updates the feedback value for the brightness value status. The object value updated last by the gateway is then actively signalled to the KNX, provided the "Transmit" flag is set on the communication object.

*after each update object "Brightness value"/"Central brightness value"*: The gateway updates the feedback value in the object as soon as a new telegram is received at the input objects "Brightness value - Setting" or "Central function... - Brightness value". A new telegram is also then actively transmitted to the KNX each time. The telegram value does not necessarily have to change. Consequently, the corresponding brightness value status telegrams are also generated, for example, in the event of cyclical telegrams to the input objects. With other functions of the gateway (e.g. at the beginning or end of a disabling or forced position function or in the event of a manual operation or scene recall), no status is sent in this setting if the brightness value status does not change.

*only if the feedback value changes*: The gateway updates the brightness value status only if the telegram value also changes. If the telegram value does not change (e.g. in the case of cyclical telegrams to the input objects with the same telegram value), the status then remains unchanged. Consequently, no telegram with the same content is output repeatedly either. This setting is recommended, for instance, if the objects "Brightness value - Setting" and "Brightness value - Status" are linked to an identical group address. This is often the case when activating by means of light scene push-button sensors (recall and storage function).
