I think so too. Look at emonPi User Guide — OpenEnergyMonitor 0.0.1 documentation (the RJ45 details are quite a way down) and what’s written above.
Not written in the guide, but here Temperature Sensing Using DS18B20 Digital Sensors — OpenEnergyMonitor 0.0.1 documentation is about how to arrange the One-wire bus: If you have a lengthy cable, don’t use a “star” configuration, instead daisy-chain from one sensor to the next. Also see yesterday’s post 1-Wire Design Guide