Hi Markus, Yes you are correct there is no difference between versions. What I have discovered is the WDP software seems to get the comm ports mixed up. I have configured one 161351 to comm 3 and the other to use comm 4. WDP will work, some of the time.! WDP sometimes assigned comm 4 to the Faller unit configured to use comm 3. Which is the reason why the Grundmodules stop responding. I also get a WDP message saying comm 3 is not support, but I know it does.!! It seem that each time I restart WDP software it becomes a hit of miss that the correct comms port match the correct 161351 Grundmodul configuration.
The only way I could get my system back was to delete both faller modules out of the digital setup. Then reprogram them back one at a time. My system is working ok at the moment , but I suspect if I have to restart that the system for any reason then it is likely WDP will become confused again.!
For your information my second faller 161351 has only just been added into my layout, up to that point I only had 1 unit and it worked every time.
Any ideas .?
Many Thanks
Steve