modbus RTU 协议解析 C++实现

Modbus RTU是一种常用的串行通信协议，用于在工业自动化领域中实现设备之间的通信。下面是一个基本的Modbus RTU协议解析的C++实现示例：

#include <iostream>
#include <vector>

// Modbus RTU帧结构
struct ModbusRTUFrame {
    uint8_t address;
    uint8_t functionCode;
    std::vector<uint8_t> data;
    uint16_t crc;
};

// 解析Modbus RTU帧
bool parseModbusRTUFrame(const std::vector<uint8_t>& frameData, ModbusRTUFrame& frame) {
    if (frameData.size() < 4) {
        return false; // 帧长度不足
    }

    frame.address = frameData;
    frame.functionCode = frameData;
    frame.data = std::vector<uint8_t>(frameData.begin() + 2, frameData.end() - 2);
    frame.crc = (frameData[frameData.size() - 2] << 8) | frameData[frameData.size() - 1];

    // TODO: 校验CRC

    return true;
}

int main() {
    std::vector<uint8_t> frameData = {0x01, 0x03, 0x00, 0x01, 0x00, 0x02, 0x84, 0x0A};
    ModbusRTUFrame frame;

    if (parseModbusRTUFrame(frameData, frame)) {
        std::cout << "Address: " << static_cast<int>(frame.address) << std::endl;
        std::cout << "Function Code: " << static_cast<int>(frame.functionCode) << std::endl;
        std::cout << "Data: ";
        for (const auto& data : frame.data) {
            std::cout << static_cast<int>(data) << " ";
        }
        std::cout << std::endl;
        std::cout << "CRC: " << frame.crc << std::endl;
    } else {
        std::cout << "Failed to parse Modbus RTU frame." << std::endl;
    }

    return 0;
}

上述示例代码中，`parseModbusRTUFrame`函数用于解析Modbus RTU帧，将帧数据解析为`ModbusRTUFrame`结构体。在`main`函数中，我们使用一个示例的Modbus RTU帧数据进行解析，并输出解析结果。