ControlNet
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ControlNet is an open industrial network protocol for industrial automation applications, this is also known as a Fieldbus. It is supported by ControlNet International.
ControlNet defines a unique physical layer based on RG-6 Coaxial cable with BNC connectors. Features which sets ControlNet apart from other fieldbusses includes the built in support for fully redundant cables and the fact that all communication on ControlNet is strictly scheduled and highly deterministic.
The physical layer signaling is based on Manchester code at 5Mbit/s.
The ControlNet application layer protocol is based on the Control and Information Protocol (CIP) layer which is also used in DeviceNet™ and EtherNet/IP™.