1.BB black connector: used to connect BB black
2.CAN pinheader
3.CAN screw terminal
4.RS485 pinheader
5.RS485 screw terminal
6. DEBUG interface: Used to debug BB Black or other connected modules
7. Power Expansion pinheader: used to connect an external power supply
8.BB black BOOT select button
9.CAN transceiver
10.RS485 transceiver
11. Power indicator
12.BB black UART TXD select jumper
13.BB black UART RXD select jumper
14. RS485 transceiver enable jumper
