1. 5V power input, using DC2.1*5.5 standard female, input range 4-9V;

2. CAN interface H / L, led by JTA1050, the carrier board has been equipped with 120 resistors;

3. CAN chip, JTA1050;

4. The main control chip: STM32F103VET6, LQFP100 package;

5. GPIO export

6. Reset button

7.32.768HZ crystal oscillator

8.8MHZ crystal oscillator

9.JTAG port, designed according to JLINK standard port design

10.SW2, SW3 function button

11.D2, D3 indicator

12. GPIO export

13.BOOT boot setting options (BOOT0, BOOT1)

14. Power supply 3.3V, GND lead-out, convenient for other wiring

15. RS485 outlet

16. MAX485 chip

17.SP3232EEN chip

18. Serial port header, DB9 female

19.AMS1117-3.3v power chip

20. Auxiliary power input port