Any possible reasons for no output or output errors

1. The sensor is a precision device, please do not remove the protective transparent cover at will

2. If the reading value is 0, check whether there is a light source and whether the product protective cover is removed

3. The 485 bus is disconnected, or the A and B lines are connected in reverse

4. Check whether the power supply meets the marking

5. The dust cover must be kept clean and wiped with a soft cloth regularly

6. There must be no water in the dust cover. If there is heavy rain, snow, ice and other long-term weather, it is recommended to cover it