code: def read_float(self, registeraddress, functioncode=3, numberOfRegisters=2):
          
          _checkFunctioncode(functioncode, [3, 4])
          _checkInt(numberOfRegisters, minvalue=2, maxvalue=4, description='number of registers')
          return self._genericCommand(functioncode, registeraddress, numberOfRegisters=numberOfRegisters, payloadformat='float')
docs: Read a floating point number from the slave.
  
          Floats are stored in two or more consecutive 16-bit registers in the slave. The
          encoding is according to the standard IEEE 754.
  
          There are differences in the byte order used by different manufacturers. A floating
          point value of 1.0 is encoded (in single precision) as 3f800000 (hex). In this
          implementation the data will be sent as ``'\\x3f\\x80'`` and ``'\\x00\\x00'``
          to two consecutetive registers . Make sure to test that it makes sense for your instrument.
          It is pretty straight-forward to change this code if some other byte order is
          required by anyone (see support section).
  
          Args:
              * registeraddress (int): The slave register start address (use decimal numbers, not hex).
              * functioncode (int): Modbus function code. Can be 3 or 4.
              * numberOfRegisters (int): The number of registers allocated for the float. Can be 2 or 4.
  
          ====================================== ================= =========== =================
          Type of floating point number in slave Size              Registers   Range
          ====================================== ================= =========== =================
          Single precision (binary32)            32 bits (4 bytes) 2 registers 1.4E-45 to 3.4E38
          Double precision (binary64)            64 bits (8 bytes) 4 registers 5E-324 to 1.8E308
          ====================================== ================= =========== =================
  
          Returns:
              The numerical value (float).
  
          Raises:
              ValueError, TypeError, IOError