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◆ TTL Wires Serial Socket Port*2
The board raises a common two wires of serial ports,can support general serial port devices on the
market，level of the serial port is 0V to 3.3V.If the abutting serial level higher than 3.3 V，must have the
isolating circuit or level conversion circuit, otherwise it will burn out master and equipment.
Notice：
1.If TTL serial port voltage can match or not, can't directly access MAX232,485 devices.
2.TX，RX connection if is correct.
NO. Definition Property Description
1 GND ground
electrode
ground electrode
2 UART-RX input/output RX
3 UART-TX input/output TX
4 VCC Power supply 3.3V output
◆ USB
The board has 2 standard USB interface，including 5 inbuilt USB socket，can be used for peripheral
expansion，default to HOST，each interface power supply current is not more than 500mA，for USB
OTG interface，can select the Host/Device by screen printing position and the jumper as below picture
on the PCB board.
USB There are two kinds of sockets ：One kind is single row pin ，Electrical definitions are as follows：
NO. Definition Property Description
1 VCC Power supply 5V output
2 DM input/output DM
3 DP input/output DP
4 GND ground
electrode
ground electrode
Serial portSerial portSerial port
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