Version 1.7.1 made a mess; reverted to 1.4.1

[pz1]

Also, I found the recommended wiring for cat5 cable, and it appears to be different from yours:

I have come closer to the solution w.r.t. wiring. As reported before the signal wire and the GND wire should be one twisted pair (green in my case).
In the meantime I also removed all other connections I had to the 1-wire gnd. That is the orange/white wire that was in the strand of the power wire, and a shortcut I made between power supply gnd and 1-wire gnd.
This configurations now works for me with three sensors on parallel wires of 1,1, and 3 meters. I have as yet to test that with a fourth cable, and with the other FUS I have.

[pz1]

In the meantime I did write to Fibaro for suggestions. I'll be back on this then.

Almost half a year later. A lot of mails back and forward to Fibaro where I had to answer many questions. Till today they have refused/were incapable to answer my question what the two different manufacturer product id's meant.

Also the new 2.1.1-rc11 release still gets stuck on interviewing the newest Fibaro Universal Sensor (both alarm sensors)