1. provide extra 2 UART TTL output

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

2. Pi UART can select TTL/232 output 

Pi UART RS232 output GND, TX, RX

Pi UART TTL output TX,RX,GND,3V3,XX,XX 

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

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

5. Provide HAT EEPROM for future driver program update.

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