Ultrasonic sensor

1.   Window mode normally-open and liner mode positive slope output function.2.   Window mode normally-closed and liner mode negative slope output function.3.   Single switching point, normally-open function.4.   Single switching point, normally-closed function.5.   Single switch point with hysteresis gap normally-open function.6.   Single switch point with hysteresis gap normally-closed function.7.   Detection of object presence-normal open function.8.   Detection of object presence-closed open function.Switching point, Setting distance only after power on. The internal clock can assure can't be changed after 5 minutes after power on. If want to change the switching point, the user can only set the request distance after power restart.For the RS485 output type.There are 2 kinds of working style,One for auto measure, the sensor will measure the distance or level repeatedly, and the measurement period can be set by the UART. The measure result can be fetched every time.The other style i