Version 2.0 has enhanced overvoltage and overcurrent protection (because 1.0 does not have overvoltage protection, 24V is connected to the computer and the motherboard is dry). The chip communication power supply voltage is manually switched through a 3P2.54 pin header jumper to adapt to 3.3V and 5V. The MCU is just like the ordinary serial port module, but with more interfaces.
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