Many of the data types are named from their 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 is often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems. Modbus enables communication with many (approximately 240) devices connected to the same network: for example a system that measures temperature and humidity and communicates the results to a computer.
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