Python 使用Modbus-RTU

//安装Modbus 相关的库
pip install pyserial
pip install pymodbus

定义基础参数

    # 配置串口参数
    serial_port = '/dev/ttyUSB0' #'COM4'  # 串口号，根据实际情况修改
    baudrate = 9600  # 波特率
    parity = 'N'  # 校验位，可选值有 'N', 'E', 'O'
    stopbits = 1  # 停止位
    bytesize = 8  # 数据位
    timeout = 1  # 超时时间，单位为秒
    client: ModbusClient
    isConnect: bool = False  # 标识是否连接
    address: int = 1  # 从站地址
    write_lock = None  # 读写锁

创建串口链接

def Start(self) -> BaseResult:
        """连接串口"""
        # 创建Modbus客户端
        self.client = ModbusClient(framer=FramerType.RTU, port=self.serial_port, baudrate=self.baudrate,
                                   parity=self.parity, stopbits=self.stopbits, bytesize=self.bytesize, timeout=self.timeout)
        # 连接到设备
        if self.client.connect():
            self.isConnect = True
            return BaseResult.Success()
        else:
            self.isConnect = False
            return BaseResult.Failure()

读写示例：   线圈及寄存器的读写都有封装的方法，方便直接的调用

    def Read_WriteProtect(self) -> int:
        """
        读取写保护状态 
        ------------
        读/写,0打开写保护1:关闭写保护
        """
        try:
            if (self.isConnect):
                with self.write_lock:
                    res = self.client.read_holding_registers(23, 1, self.address)
                    pass
                return res.registers[0]
            else:
                return -1
        except Exception as ex:
            LogOperate.error("Read_WriteProtect", ex)
            return -1

    def Set_WriteProtect(self,state)->BaseResult:
        """
        设置写保护状态
        ------------
        state: 0打开写保护 1:关闭写保护
        """
        try:
            if (self.isConnect):
                with self.write_lock:
                    res = self.client.write_register(23, state, self.address)
                    pass
            return BaseResult.Success()
        except Exception as ex:
            LogOperate.error("Set_WriteProtect", ex)
            return BaseResult.Failure()