OSRAM QUICKTRONIC INTELLIGENT DIM CFL - Manual (Page 24)

23
Voltage
“Biphase" databit
coded with value “1"
High level (= idle state)
Low level
Current
Current consumption < 2 mA
Current consumption
< 250 mA (active limit
by the DALI supply)
Incoming data
telegram
ECG response
“Biphase" databit
coded with value “0"
Figure 12: Data transfer using the Manchester code on the DALI line
Data is transferred using the Manchester code. The signal edges in
the middle of the bit carry the information here. A trailing edge indi-
cates a logical zero and a rising edge a logical one.
2.6.1 Behavior in the event of a fault
If there is no power at the DALI interface (controller faulty or switched
off), the System Failure Level is set. The Power On Level is activated
after a mains voltage failure (230 V). The System Failure Level has the
higher priority.
Both values are set at the factory to 100 % luminous flux, but can
be individually programmed with the Dali Luminaire Tool (DLT) from
OSRAM, for example.
2.7 The DALI dimming curve
IEC 62386 defines the dimming range of a DALI controller from 0.1 to
100 %. The dimming curve is shown in the graphic below. As far as
the eye is concerned, this categorization is a linear response
5 accord-
ing to the Weber-Fechner Law.
5 The Weber-Fechner law states that the subjective strength of sensory stimuli is
logarithmically related to the objective intensity of the physical stimulus.