code: def set_control_mode(self, modevalue):
          
          minimalmodbus._checkInt(modevalue, minvalue=0, maxvalue=3, description='control mode') 
          self.write_register(4101, modevalue)
docs: Set the control method using the corresponding integer value.
                  
          Args:
              modevalue(int): 0-3
              
          The modevalue is one of the keys in :data:`CONTROL_MODES`.