From Ethersex Wiki
DALI light control provides the software layer to control DALI enabled digital ballast and transformers.
DALI is an abbreviation for Digital Addressable Lighting Interface
DALI bus physical layer
- one master (Ethersex) and up to 64 lights (targets) on one bus
- 2 wire, no complex topology restrictions, no termination
- targets may only answer on master's request
- bus is isolated, but not SELV -> should be galvanic isolated on master's side
- 1200 baud, manchester-encoding
- 22.5VDC to 9.5VDC (16VDC nominally) is high level
- 6.5VDC to -6.5VDV (0VDC nominally) is low level
- bus is powered and held to high level by master
- targets (slaves) short the bus to transmit a low value
- master has to limit the current to 250mA
ECMD commands
| Command Syntax
| Short description
|
| dali raw <byte1> <byte2>
| Sends a raw frame with 2 hex bytes. If you know what you are doing...
|
| dali dim <target> <level>
| Dims the specified target to the specified dim-level (0-254)
|
| dali cmd <target> <command> [!] [?]
| Sends a command (decimal) to the target. For a list of commands see the NXP application note or the DALI standard. To automatically repeat the command add a ! to the end of the command (necessary with some commands). A ? at the end means that command waits for an answer from the target. This answer is being returned as a decimal value. Not all commands will send an answer.
|
| dali scmd <command> <data> [!] [?]
| Sends a special command to all connected targets (decimal 256-287). For a list of commands see the NXP application note or the DALI standard. A ? at the end means that command waits for an answer from the target. This answer is being returned as a decimal value. Not all commands will send an answer.
|
Values for the <target> parameter:
| Targetcode
| Description
|
| all | All / Broadcast
|
| snn | short address 0-63 (decimal)
|
| gnn | group address 0-16 (decimal)
|
Examples
| Example
| ECMD
|
| Dim all targets to 100%
| dali dim all 254
|
| Target 12 off
| dali dim s12 0
|
| Targets in group 3 to 50%
| dali dim g3 127
|
| Set dim-speed on all targets to approx. 5.6 seconds (t=1/2*SQRT(2^x), x=1-15) | dali scmd 257 7
dali cmd all 46 !
|
| Get actual dim value from target 4
| dali cmd s4 160 ? Reply: 180
|
| Is a target with short address 8 existing?
| dali cmd s8 145 ? Reply: 255 (means true)
|
| Malfunction at target 8? | dali cmd s8 146 ? Reply: READ TIMEOUT (No answer means no malfunction)
|
| Program the single connected target the short address 3
| dali scmd 257 3
dali cmd all 128 !
|
External sources
If you are lucky, you can find the official DALI standard document IEC 60929 on google.
