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Hi, I am developing a communication between ARM cortex based controller which does some controlling and reading of data and sends it on the modbus protocol with port rs485 and ttl. I am new to in embedded systems and c language and with no support, so please anybody provide me source code for modbus rtu master application on which I can display data accordingly with some modification its urgent.Also kindly suggest me the shortest path to develop such application. Suggestion are welcome.