The last weeks I spent some time in extending the DMXSerial library for Arduino to support the DMX - RDM protocol by using the DMX Shield for Arduino.
A prototype version (proof of concept state) is already working. So now I know that the layout of the shield is RDM compatible.
But there is still some work to do for the library. I’ll try to publish a new version of the DMX library in some weeks.
If you are interested in co-working please let me know.