2. The implementation functions are: 1. Basic input and output 2. The USB port provides 5V power supply 3. The USB power port can be used to download the microcontroller program. 4. There is an external OLED interface 5. There is a TTL interface for external debugging 6. There are three button inputs and a three-wire transmitter input 7. Three LED light test outputs and two 24V relay outputs. 8. Internal optocoupler isolation input and optocoupler isolation output 9. External input 24V main power interface. 10. There is an external output 24V load circuit interface.
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