Crestron
DIN-DALI-2
DIN Rail 2 Channel DALI Interface
Programming Guide – DOC. 7365A
DIN Rail 2 Channel DALI Interface: DIN-DALI-2
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The group information is also updated for any ballasts that power up. This is to
accommodate Lutron
®
EcoSystem
®
ballasts that do not store group information in
non-volatile memory.
The levels and group information are also sent out whenever the DIN-DALI-2 unit
powers up.
The DIN-DALI-2 also stores a complete copy of all information that is stored in the
individual ballasts, such as scene levels, groups, addresses, fade time, etc. This is
used so that that the DIN-DALI-2 can report simulated levels back to the control
system without waiting to extract information from each ballast and is also used
when replacing a failed ballast (refer to “Ballast Replacement” on page 4 for more
information).
DALI Wiring Considerations
The DALI protocol places few restrictions on wiring since data rate is very slow and
voltage levels are high.
It is recommended that #18 fire alarm wire with shield be used. This wire size limits
the maximum length of a DALI loop. The maximum length of run from the
controller to the farthest ballast should not exceed 500 feet (155 meters), but the total
wire on the loop can exceed 500 feet (155 meters). For example, it would be
acceptable to have ten 100-foot (31-meter) runs to groups of ballasts.
Exceeding the maximum length of a loop affects communication between the ballast
and the DIN-DALI-2 controller. Communication is affected in reverse direction (the
ballast talking to the DIN-DALI-2) first.
