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Many early PCN's were serial based, using low level standards such as EIA RS-422 and EIA RS-485 with proprietary Protocols on top. One of the De Facto Standard s (which is now becoming an Open Standard ) is Modbus , originally from Modicon. Many PCN's used Token Ring token passing based protocols because they are essentially deterministic. Both Allen Bradley and Eurotherm utilised such mechanisms. Many of the measurement and control unit manufacturers signed up to the Fieldbus consortium but rather than one standard emerging each manufacturer promoted their own 'standard' leading to a myriad, and confusing, range of physical and logical systems.