WT99-DK - General purpose development board

Power supply header

The power supply output pinout can provide 3.3V or 5V voltage.

Power switch

5V power switch

Micro USB
Female socket

The USB interface is used for power supply to the board,
for flashing firmware to the chip, and for communication
with the chip using USB protocols.

TX RX Level
jumper port

Control the I/O port level of TX/RX, you can select 3.3V
or 5V, default 3.3v.

USB-to-UART
Bridge

A single chip USB to UART bridge, baud rates:
50bps-6Mbps.

UART to RS485
circuit

Reserved UART to RS485 communication interface.

Power LED

The board is connected to a USB power supply, and when
the power switch is pressed, the indicator light is lit.