Thanks Henrik.

The network of sensors will be different in every case. The end user will have 1 up to 8 max of these sensors.

They are connected in mixed ways, some with stubs of short length, others directly on the cable. I insisted on seperate line for the power and not use a parasitic power. After all, a UTP cable can support that.

At short distances it works just fine. Longer cables have some times error in the communication and lowering the pull-up, sure helps a lot.

I have read that article by Analog about active pull-ups. The problem, for me, is to write a routine that will do all of the signal handling, plus the 1-wire protocol, since OWIN and OWOUT do not support such a circuit.

Ioannis