An overview of the wiring variants can be found here:
http://www.1wire.org/media/A_Guide_to_the_1WRJ45_Standard_Draft.zip
Who does not want to struggle through all the variants may use the following universal
and sustainable scheme for the RJ45 pin assignment.
Color Specification acc. to: | |||
Pin | EIA/TIA 568A | EIA/TIA 568B | |
1 | Green/White | Main Supply GND | Orange/White |
2 | Green | Main Supply +5V/50mA for 1-Wire Components | Orange |
3 | Orange/White | Secondary 1-Wire Bus GND | Green/White |
4 | Blue | Primary 1-Wire Bus | Blue |
5 | Blue/White | Primary 1-Wire Bus GND | Blue/White |
6 | Orange | Secondary 1-Wire Bus | Green |
7 | Brown/White | Auxiliary Supply i.e. +12V/200mA for other consumers | Brown/White |
8 | Brown | Auxiliary Supply GND | Brown |
Note: For long busses the ohmic resistance has a negative effect on the
supply voltages. Use an application-side power supply to prevent that.