1. provide extra 2 UART TTL output

 TTL output signal  --> TX,RX,GND,3V3,CTS,RTS

2. i2c signal out GND,5V,SDA,SCL for extend extra UART HAT

3. It provides an individual 3.3V power for UART & output port

4. Provide HAT EEPROM for future driver program update.

5. Pi 3B & Pi Zero W still can use on board Bluetooth BLE & WiFi

Serial GUI Control Panel
Control up to 8 Serial Ports

• 1. Scan: Scan for available UART devices.
• 2. Launch cutecom together when starting Serial Port.
• 3. Port number in system
• 4. Baud Rate choose
• 5.6.7.  UART Port  Information:  Port Address 0x48,0x49, 0x4c, 0x4d

 Chip Address Location, Channel Number ( 1 / 2 ), TX and RX receive counter,and Serial port Location /dev/pts/X

• 8. Start : Start UART port

Also provided is a terminal command mode to activate serial ports through a terminal / ssh.
You can also activate a serial port on boot up with the provided software.
Commands for starting the serial ports via command line;
./Pi8s -a ADDR -c CHANNEL -b BAUD -s DEVPTS
ADDR = Address of Serial Port e.g. 0x48, 0x49, 0x4C, and 0x4D
CHANNEL = Channel of serial Port ( 1 / 2 )
BAUD = Baud Rate for the Serial Port
DEVPTS = PICOM Service Number ( Will direct the filename to /dev/picomX where X = your number )
For example, To start a serial port from 0x49, on channel 2 with 115200 Baud run the following;
./Pi8s -a 0x49 -c 2 -b 115200 -s 1
This will activate the serial port and then set /dev/picom1 to your serial port location /dev/pts/X

1. device ->   /dev/pts/1       

2 . Baud rate  à 38400

3. click Open device  

4. input AT command (HC-05 blutetooth module)

5. screen will show Bluetooth module response