Appendix A: Dali Protocol Summary - Crestron DIN-DALI-2 Programming Manual

DIN Rail 2 Channel DALI Interface

Appendix A: DALI Protocol Summary

DALI Protocol Configuration
16 • DIN Rail 2 Channel DALI Interface: DIN-DALI-2
DALI uses a Manchester encoded unidirectional serial protocol with a transmission
rate of 1.2 kHz. The bit time is 833 μs ±10%.
The frame of the main unit consists of 19 bits (15.9 ms):
• 1 start-bit (logical 1)
• 8 address bits
• 8 data bits
• 2 stop bits (physical high level)
The answer frame of the sub unit consists of 11 bits (9.2 ms):
• 1 start-bit (logical 1)
• 8 data bits
• 2 stop bits (physical high level)
To select the devices by the different addressing modes (broadcast, group, single),
use the address types shown in the following table.
Addresses Used for Different Command Types
COMMAND TYPE ADDRESS*
Broadcast 1111111S
Group 100AAAAS
Single 0AAAAAAS
Special command: 101CCCC1;
110CCCC1
* The S distinguishes between a direct arc power command and a DALI command.
If S = 0 the following data is interpreted as a power level with a value between
0x00 (off) and 0xFE (maximum power level).
Standard commands are listed in the table beginning on the following page.
Crestron DIN-DALI-2
NOTES
AAAA = 0 to F (Group Address 0-15)
AAAAAA = 0 to 3F (Short Address 0-63)
CCCC = special command number
Programming Guide – DOC. 7365A