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Most of the time, a system that measures temperature and humidity and sends the results to a computer uses Modbus to send signals from instrumentation and control devices back to a main controller or info gathering system. In view of expert slave engineering, they offer high functional adaptability Its sequential RTU mode speeds up information trades with its 8 bit encoding while at the same time permitting the association (with repeaters) of 247 peripherals over a distance of 1200 meters. TCP/IP doesn't characterize what the information means or how the information is to be deciphered, it is just a vehicle convention. Modbus, on the other hand, is an application protocol. It is essentially a messaging structure that is independent of the underlying physical layer and defines rules for organizing and interpreting info.