Fig.: PBus Mastervolt Adapter (Phillipi)
The PBus is not actually a marine bus system like the other marine bus systems. The PBus was developed by Philippi for a niche application to connect current sensors and some other sensors such as level sensors to Phillipi display devices. The protocol is based on the CAN layer at the lowest level. The components are equipped with standardized M12 connectors, as used with NMEA2000. However, it should be noted that PBus devices and NMEA2000 devices may not be operated together in the same bus system, even though they use the same connector technology. PBus does not use the CAN protocol at a higher level and relies on a slow serial protocol.
Further technical information on the PBus protocol is not known. PBus devices can only be used in Philippi's PBus networks and are not compatible with other bus systems. Phillipi does not offer gateways to other marine bus systems. The only exception is the PBus Mastervolt Bridge, which allows integration of Mastervolt devices.
There are no open source implementations for the PBus.