Besides assignment of individual and group addresses and status scanning, the DALI interface facilitates the transmission of many DALI parameters and DALI commands from the control device to the control gear units. The most important DALI parameter used in all DALI applications is the dimming value. It is transmitted in 8-bit resolution (255 steps from 0% to 100% and “unmodified”). Further DALI parameters can be used on an application-specific basis. They are frequently transmitted to the control gear units in the context of initialisation during commissioning or at every switching-on of the power supply of a control device. They serve to optimise the overall system’s operation. The range of utilised parameters as well as their pre-settings can vary vastly between control devices. It is therefore advisable to perform a reset of all DALI parameters in an existing lighting installation when exchanging the DALI control device to prevent possible interference effects by parameter settings established by the preceding device. With the help of a DALI programming device, DALI parameters can also be set manually. It is important to observe, however, that they might subsequently be overwritten when initialising a control device (see chapter ). Adjustable DALI parameters are described in table.
