Hi Dennis, thanks, very interesting.
I have got another bus system as described by me recently in a rather old topic here Urmet 1134/2 - #22 by martin.dolan.
I have solved Open problem by direct shortcuting the opening button, which in my case is mechanical.
I’m struggling to make Ring detection work. In your opinion, is there any reason why the RSR-210 should only work in the Elcom I2 system?