code: def duty_cycle_sp(self):
          
          self._duty_cycle_sp, value = self.get_attr_int(self._duty_cycle_sp, 'duty_cycle_sp')
          return value
docs: Writing sets the duty cycle setpoint. Reading returns the current value.
          Units are in percent. Valid values are -100 to 100. A negative value causes
          the motor to rotate in reverse.