 When the bus is idle, it is high voltage all the time (which is not the same as a data bit).Frames begin with a "1" start bit, then 8 to 32 data bits in msbit-first order (standard RS-232 is lsbit-first), followed by a minimum of 2.45 ms of idle.A DALI device, such as an LED driver, can be controlled individually via its short address.