Time and day of the week (timer function)

Introduction

The gateway has an internal clock that tracks the time of day and day of the week and provides the "Colour Transition Mode (CTM)" and "Human Centric Lighting (HCL)" functions. The above functions require the current time and day of the week to implement the daytime colour temperature and daytime colour gradients. In order for the time and day of the week to provide the internal functions correctly, it must be set cyclically via the KNX. A separate communication object is available for this purpose. The data format of this object can be configured.

To ensure sufficient accuracy, we recommend setting the clock with a KNX telegram at least once a day. For this purpose, it is recommended that a master clock is prevent in the KNX installation that provides the time and day of the week according to the set data format.

The gateway accepts telegrams for setting the time and day of the week only if the information provided is valid according to the KNX specification. If information in the KNX telegram is marked as "invalid" or contains errors, the gateway does not evaluate the data concerned. In this case, the internal clock is considered not to be set. If the KNX telegram for setting the clock contains the information "all days", the gateway no longer evaluates a discrete weekday and executes all configured functions only cyclically every day according to the stored times.

No times or days of the week are updated if the gateway has not yet received any or a valid KNX telegram to set the internal clock after initialisation (after the mains voltage returns or an ETS programming operation). In this case, the daytime colour temperature and daytime colour gradients have no function!

The gateway can automatically trigger a read telegram after a reset by setting the "initialisation flag" (I flag) at the communication object "Weekday/time" or "Date/weekday/time". The linked KNX master clock then usually sends the current time with weekday back to the gateway in response to this telegram. In order for the master clock to respond, the "read flag" (R flag) must be set at the corresponding communication object.

Setting the data format for the time and day of the week

The parameter "Format for day of week and time" in the "General" parameter node specifies the data format for setting the internal clock for the gateway. This allows an adjustment to be made to the output of the KNX master clock used.

The clock of the gateway only needs information about the time and the current day of the week. The date contained in the KNX telegram according to the 8-byte format (DPT 19.001) is not relevant and is not evaluated when setting the clock.