non-ethernet connection refers to Wifi connection where radio signals are transmitted through the air, so a direct connection is not required.Fieldbus is a group of protocols that are used in the industrial arena. Basically, Fieldbus works on a network that permits various topologies such as the ring, branch, star, and daisy chain.some of the non-ethernet entails the realm of process automation and SCADA (Supervisory Control and Data Acquisition), the Modbus communication protocol is the oldest and most widely used. Modbus offers a standard language for devices and equipment to interact with one another.secondly, an industrial setting where high-tech gear is housed is where PROFIBUS’ serial protocol is used to reliably send data. Message structure, network access and fault detection procedures are all specified in the protocol. Sending data over a serial protocol in an industrial setting necessitates the use of complex machinery. Message structure, network access and fault detection procedures are all specified in the protocol. The whole protocol is handled by ASICs (chips).