1. RS485 interface is passive output, need external connect 5V power supply and the the external power supply should >100mA.
2. When the input test voltage is less than 7V, it must supply 5V independent work voltage through MICRO USB port;
Note: Do not use the USB port bring by your PC to be the independent power supply, otherwise it may damage your PC !
3. Working temperature
-20’C ~ +60’C。