1. Whether the power supply is stable, with 12V/1A power supply
2. Whether the wiring is correct, confirm that the RX TX is not reversed
3. Whether it is co-located
4. The default baud rate is 9600
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1. Whether the power supply is stable, with 12V/1A power supply
2. Whether the wiring is correct, confirm that the RX TX is not reversed
3. Whether it is co-located
4. The default baud rate is 9600
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