Modbus is a standard communication protocol used in automation systems that allow devices located on an industrial network to communicate with each other. It is an open communications protocol used mainly in Supervisory Control and Data Acquisition (SCADA) systems and allows for the exchange of data between networks, including data acquisition, control, or automation systems. The Modbus protocol relies on four main components, which are the physical layer, the data link layer, the transport layer, and the application layer.
The physical layer component is where the actual data is transmitted. This component is responsible for the transmission of data between nodes, as well as for providing electrical and mechanical connections between the two nodes. The data link layer is responsible for the recognition and synchronization of information sent from one node to another. The transport layer is responsible for the delivery of packets from one node to another. Finally, the application layer is responsible for the interpretation of data by the nodes and for providing services such as data compression, error detection and correction.
4 Wire Modbus is a communication protocol used in automation systems that uses 4 wires instead of the usual 2 wire configuration. The 4 wires are used to support the transmission of data between two points, increasing the reliability of data transfer over the network. 4 Wire Modbus allows for faster transmissions between nodes, as well as greater flexibility when dealing with larger data packets. As a result, this protocol is becoming increasingly popular in various automation systems, helping to increase the efficiency of communication between devices on the network.
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