RS485 x4  for Raspberry Pi  B+ 2B 3B (with HAT EEPROM)

  for  other Linux OS  without HAT EEPROM support



1. Provide extra 4 UART TTL output `
     4x UART TTL output TX,RX,GND,3V3,CTS,RTS 
2. 2 set i2c signal out GND,5V,SDA,SCL for extend extra UART HAT 
3. TTL UART1 support ESP8266 WiFi module socket
4. It provides an individual 3.3V power for UART & output port
5. Provide HAT EEPROM for future driver program update.
    Provide other Linux OS support (without HAT EEPROM )(option)
6. Extension port for RS232/Rs485 module board
7. Raspberry Pi model 3B & Pi Zero W still can use on board Bluetooth & WiFi








Serial GUI Control Panel
Control up to 4 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. RS485 : Enable RS485 in this Port
  • 9. 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;
./Pi485 -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 9600 Baud run the following;
./Pi485 -a 0x4c -c 2 -b 9600 -s 1
This will activate the serial port and then set /dev/picom1 to your serial port location /dev/pts/X




  Enable RS485 in command mode




1. device ->   /dev/pts/1        2 . Baud rate  38400

3. click Open device  

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

5. screen will show Bluetooth module response  


type "top" in terminal 
Enable 4 Port RS485 
 You will see Pi485 run in system 
for other Linux OS type "top" in terminal 
Enable 4 Port Linux485 
 You will see 4x Linux485 run in system 
File Download      

  Software Pack

  User Manual


Package Content

  1x Rs-Pi 4xUART-Ext Main Board

1x RS485x4 extension board

1x manual 



Raspberry Pi

extra UART




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