Automatic colour wheel sequence

Introduction

The colour wheel sequence is used for the automatic overall colour control of DALI lights. This function uses the cyclical adjustment of the hue angle in the HSV colour wheel. This results in continuous colour gradients that can be started and stopped at will during the running time of the gateway.

After starting, the automatically controlled step-by-step sequence of the colour wheel begins. With each step, the current hue is either increased or decreased depending on the configured "sequence direction", converted into an RGB value and transmitted on the DALI line. The number of steps and consequently the increment of the hue is derived from the configured "total running time". The longer the total running time is considered in a full colour wheel sequence, the finer is the hue adjustment during the sequence and thus the colour resolution.

The adjustment of the hue always starts with the colour currently set when groups or single devices are switched on. For switched-off groups or single devices, the start-up behaviour is determined by the parameter "When starting in switched-off state". Here it is possible that the start does not switch on the affected group or single device and the gateway executes the colour sequence only internally. Only a subsequent switch-on then switches the lamps to the internally tracked colour. Alternatively, starting a colour wheel sequence can immediately switch on a group or single device in the OFF state. In this case, the colour wheel sequence starts at an individual start value. This start value can either be specified as a fixed initial hue (optionally with static white value) in the ETS, or alternatively it can be set to the colour at which a stop was last executed in the course of a previous colour wheel sequence.

The sequence direction may be either clockwise, anti-clockwise or alternating (toggling). When switching over, the gateway automatically changes the direction of the colour wheel sequence after each start. The hue adjustment range is limited to 0° to 360° according to the HSV colour space. It can be defined in the ETS whether the colour wheel sequence is stopped or continued in the same direction without interruption after reaching the range limit 360° or 0°. Optionally, a short visualisation can be carried out by the lamp when the range limit is reached in order to continue the sequence afterwards. This visual feedback is provided by briefly switching the assigned DALI operating devices off and on again. The time between OFF and ON is invariably 1 second.

A colour wheel sequence always stops as soon as a stop command is received with the KNX communication object "Automatic colour wheel sequence - Start/stop". The colour last set by the colour wheel sequence is initially retained until it is changed by a new colour wheel sequence or by other functions of the gateway. A sequence is started and stopped by an object whose data format can be configured either to 1-bit (DPT 1.010 / "1" = start, "0" = stop) or alternatively to 4-bit (DPT 3.007 / "Dimming step up or down" = start, "Dimming stop" = stop).

The colour wheel is always run through according to the hue of the HSV colour space, regardless of which colour space is configured for the group or single device. The colour specified by the hue is automatically converted by the gateway into an equivalent RGB value and forwarded to the DALI operating devices.

The additionally controllable white value (W) available in the "RGBW..." or "HSVW..." colour spaces is always static in the automatic colour wheel sequence. The white value is not changed dynamically.

During a colour wheel sequence, the values for colour saturation and brightness remain constant at the maximum value (100%). Only the hue is adjusted.

Setting the start/stop behaviour of the colour wheel sequence

The parameter "Start and stop by" on the parameter page "DALI system... -> Configuration groups -> [x] Group name -> Colour -> Colour wheel sequence" or "DALI system... -> Configuration single devices -> [x] Device name -> Colour -> Colour wheel sequence" specifies the data format of the communication object for starting and stopping the automatic colour wheel sequence.

Changes in brightness do not stop a colour wheel sequence in progress if this does not change the switching status. The colour wheel sequence is stopped when the affected group or single device is switched off (brightness 0%).

The colour wheel sequence and brightness sequence cannot run at the same time. As soon as the colour wheel sequence has been started, the brightness sequence is automatically stopped. The same applies vice versa. It is not permissible to link the start/stop objects of both functions of a group or single device with identical group addresses!

During an activated lock or forced position, any colour wheel sequence that has been started has no effect. If the parameter for the specification of the behaviour of the colour at the end of the disabling function is configured to the setting "track", the tracked colour of a running colour wheel sequence is set at the end of the lock, provided the group or single device concerned is switched on. If no colour tracking is configured at the end of disabling, the automatic colour wheel sequence is stopped.

During an active manual operation, any colour wheel sequence that has been started has no effect. At the end of a manual operation, the tracked colour of a current colour wheel sequence is set. A valid scene recall stops the automatic colour wheel sequence. After an ETS programming operation, a colour wheel sequence is always stopped.

No colour status telegrams are generated during a colour wheel sequence (not even during a continuous sequence after reaching the range limits and direction reversal). Only when a sequence is stopped does the gateway send out the current colour as a status.

If several colour wheel sequences run simultaneously in different groups or single devices, this can cause an overload of the DALI system, whereby calculated hues cannot always be safely transmitted to the operating devices.

Setting the starting behaviour of the colour wheel sequence in switched-off state

The adjustment of the hue always starts with the colour currently set when groups or single devices are switched on. When groups or single devices are switched off, the start-up behaviour is determined by the parameter "When starting in switched-off state" on the parameter page "DALI system... -> Configuration groups -> [x] Group name -> Colour -> Colour wheel sequence" or "DALI system... -> Configuration single devices -> [x] Device name -> Colour -> Colour wheel sequence".

Setting the direction of the colour wheel sequence

The "Sequence direction" parameter on the parameter page "DALI system... -> Configuration groups -> [x] Group name -> Colour -> Colour wheel sequence" or "DALI system... -> Configuration single devices -> [x] Device name -> Colour -> Colour wheel sequence" defines the sequence direction of an automatic colour wheel sequence after starting.

1. Set the parameter to "clockwise".

• According to the HSV colour space, the colour wheel is always run though clockwise (0° --> 360° / red --> green --> blue --> red).

2. Set the parameter to "anti-clockwise".

• According to the HSV colour space, the colour wheel is always run through anti-clockwise (360° --> 0° / red --> blue --> green --> red).

3. Set the parameter to "toggle".

• When switching over, the gateway automatically changes the direction of the colour wheel sequence after each start (clockwise --> anti-clockwise --> clockwise).

Setting the behaviour at the range limit of the colour wheel sequence

The hue adjustment range is limited to 0° to 360° according to the HSV colour space. The parameter "On reaching the range limit" on the parameter page "DALI system... -> Configuration groups -> [x] Group name -> Colour -> Colour wheel sequence" or "DALI system... -> Configuration single devices -> [x] Device name -> Colour -> Colour wheel sequence" defines the behaviour when the range limit (360° or 0°) is reached.

Setting the total running time of the colour wheel sequence

After starting the colour wheel sequence, the step-by-step run through the HSV colour wheel begins. With each step, the current hue is either increased or decreased depending on the configured sequence direction, converted into an RGB value and transmitted on the DALI line. The number of steps and consequently the increment of the hue is derived from the configured "Total running time", which can set by the corresponding parameter on the parameter page "DALI system... -> Configuration groups -> [x] Group name -> Colour -> Colour wheel sequence" or "DALI system... -> Configuration single devices -> [x] Device name -> Colour -> Colour wheel sequence".

The total running time exclusively defines the duration and the hue increment of a full colour wheel sequence. It does not specify a start or stop time. A sequence can be stopped before the total running time has elapsed.