Modbus-TCP STM32+W5500 protocol for the entire pro
2016-08-23
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After these days of learning and debugging, and finally in the STM32F103VCT6+W5500 (SPI1) +Freemodbus platform, the function of Modbus-TCP protocol. In fact, very simple, as long as familiar with the Modbus-RTU communication, understand the structure of the Modbus frame, Modbus-TCP just in the original frame structure to add a head, to a tail, and then use TCP to transfer.The key content is how to get the W5500 newly received data packets, and sent to the Modbus event state machine driven protocol execution, data processing.The main reference demo Modbus-TCP in the Freemodbus protocol implementation ideas, access to read and write buffer zone to send the response.c
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