USB to serial port with power supply, directly connect to STM32 UART1 for convenience in debugging; RS232 port, DB9 port, directly connect to UART2; TF card, SDIO mode; USB - SLAVE function, with power supply; FSMC bus mode to drive DM9000 network module; With one power LED indicator light and two user LED indicator light; USB to serial, transmit-receive LED indicator light; JTAG debugging port; DM9000 mode; IO port out; With one schottky barrier diode to protect the USB port from damages in case of partial short-cut of the power supply; With one power switch, and four location holes around.