Many of the data types are named from its use in driving relays: a single-bit physical output is called a coil, and a single-bit physical input is called a discrete input or a contact. Modbus allows communication between many devices connected to the same network, for example a system that measures temperature and humidity and communicates the results to a computer. It has been developed with industrial applications in mind.Modbus communication protocol presents the follow features: Simple and robust, it has since become a de facto standard communication protocol, and it is now a commonly available means of connecting industrial electronic devices. Modbus is located in the level 2 of the OSI model, and uses a master/slave (or client-server) architecture. Modbus is a serial communications protocol originally published by Schneider Electric in 1979 for use with their programmable logic controllers (PLCs).
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