12 V lithium battery for power supply, motherboard DC DC USES MP2315 5 V output, using STM32F405RGT6 as main control unit, control of omron relay, to control the power of the 485 module (3.3 V power supply, there are 5 V to 3.3 V) on single chip microcomputer, to achieve low power consumption, open, single chip microcomputer open relay will reset in a row, do not put 485 module will not reset, a great god, please give directions!

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Thank you for your help