How to set DAPC level (dim level) directly using DALI

In order to directly set the power level for a given control gear (lamp) using DALI, you have to send the following two bytes:

  1. The short address of the control gear, multiplied by 2
  2. The data byte containing the power level (0...255).

In order to distinguish between command messages (frames) and DAPC (direct arc power control) messages, remember that the 1st bit must always be 0 for DAPC messages.

For example, if you want to set half brightness level for the lamp with short address 3, send the following bytes:

  • 6 (= 3 * 2)
  • 127 (= half brightness)