Dear Jeff,

Thank you very much for your helpful information. I didn't knew that.
I always thought i am doing something wrong :-)
OK. I have thought that a wireless solution could be less reliable than a wired one because more batteries, that could fail... but that could be a good solution for me to. On the other hand i am a bit of a "do it yourself" type and i guess i'll try to make my own cable.

Thank you very much, now i know how to go forward with this project and i'm happy to post the results here !

kind regards from Switzerland

Lars