http://www.lutron.com/TechnicalDocumentLibrary/040249.pdfFull integration protocol for reference if anyone is interesting in digging in. Pages 46 to 51 should provide most of the relevant information.
The key points I believe are:
To help create and manage the different integration operations, three distinct operation characters
have been selected to begin each command. All protocol messages will start with one of the
following operation characters:
# Execute an action (e.g., turn a dimmer on/off)
? Query system information (e.g., determine on/off status of a dimmer)
~ Monitor responses from the system when requested or after a change has occurred (e.g., if
someone turns on a dimmer locally, a response command is sent out to indicate the change)
Output Command Format
#OUTPUT, Device ID, Action Number, Paramaters
Example
#OUTPUT,2,1,70,4,2
Set output level on device #2 to 70% (fade 4 seconds, delay 2 seconds).
~OUTPUT,12,1,100.00
This is the string that is sent by Lutron when device #12 is set to 100% (fade 0 and delay 0 are optional and omitted).
So Loxone would have to establish a telnet connection with the Lutron processor and then be configured to send the strings, or react in a particular way when it sees the relevant string.