﻿The behaviour configured at this point is executed after the bus or mains voltage returns (mains voltage of the gateway). If mains voltage only on the connected DALI operating devices (e.g. supply from an external mains conductor) is switched on or the gateway is also switched on again and the response is configured to "no reaction", the operating devices set themselves to the brightness specified in their "Power-On level". After an ETS programming operation, this value is programmed into the operating devices by the gateway and corresponds to the setting of this parameter. In the settings "Brightness before bus/mains voltage failure" and "Activate staircase function", the command "no reaction" is programmed as a power-on level into the operating devices. In the case of all other settings, the configured commands are applied directly in the operating devices. If the mains voltage of the gateway is switched on, the device executes the parameter only after initialisation. It may occur that the DALI operating devices react more quickly after bus voltage return and set themselves to the power-on level before the gateway can transmit individual commands on the DALI line. This may result in short brightness jumps. If KNX telegrams for groups or single devices are received during the initialisation of the gateway, the device will perform the most recently specified command and not the configured behaviour after the bus voltage returns.

When using standby switch-off and the delay until start-up of the DALI devices, ensure that this parameter is configured to "Switch off". This means that the affected devices do not switch on directly when the mains voltage returns but only after they have received an appropriate DALI command from the gateway via the DALI cable.

*Brightness value*: The DALI operating devices are set to the value specified by the "Brightness value" parameter over the DALI line after the bus or mains voltage returns at the gateway.

*Switch-off*: The DALI operating devices are switched off when the bus/mains voltage returns via the DALI line.

*Brightness before bus/mains voltage failure*: After the bus or mains voltage returns, the brightness value set most recently before the bus or mains voltage failure and saved internally on bus/mains voltage failure is tracked. An ETS programming operation of the application or the parameter resets the internally stored brightness state to "OFF".

*No reaction*: After the bus or mains voltage returns, the gateway does not transmit any commands to the DALI operating devices. The assigned operating devices do not respond and remain in the brightness state that was last set. In this state, no colour temperature control or colour control is possible after bus or mains voltage return even if the devices are still switched on due to the last brightness state. In this case, the group or single device concerned must either be switched off and switched on again after bus or mains voltage return or must be preset to a brightness value unequal "0%" by a new telegram. Only in this way does the gateway evaluate the state "ON" for the operating devices and permits a control of the colour temperature or colour by new commands.

*Activate staircase function*: The staircase function is activated - independently of the object "Staircase function - Start/Stop" - after the bus or mains voltage returns. This setting is available only when the staircase function is enabled for the affected group or single device.
