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modbus RTU Slave & modbus RTU master & modbus TCP IP PROTOCOL

modbus RTU Slave & modbus RTU master & modbus TCP IP PROTOCOL
have any idea modbus RTU Slave & modbus RTU master & modbus TCP IP PROTOCOL for communication standard hmi
(Human machine interface) and standard scada. how can i implement this protocol in this stm32f4 discovery kit.
Every time i see the video in USART communication. nobody develop modbus protocol.WHY?