RS232 x4 /RS485 x4  for Raspberry Pi  B+ 2B 3B & Pi Zero


1. Provide RS232 x4 or RS485 x4  DB9 or RJ45 output
2. Jumper setting RS232 / RS485 output
3. RS485 auto RTS control by software
4. On board DS18B20 1Wire Temperature sensor
5. 128x64 0.96" OLED screen for COM port information
6. Provide 8 GPIO control LED
7. 1 GPIO 5V Mini Fan control pin (ON/OFF control ) ( 2.0mm / 2.54mm pitch )
8. On board RTC function with CR1220 Battery socket
9. 4 UART  Board Power select jumper from Pi or Micro USB
10. 5V Mini Fan Power select jumper from Pi or Micro USB
11. It provides an individual 3.3V power for UART Board
12. Provide HAT EEPROM for future driver program update.
13. One software control Micro Switch for Program ( Shut Down , reboot....)
14. 5 software control Micro Switch for OLED screen control.
15. use 20x2 40pin cable connect to Pi
16. PCB size 110mm x 85mm
17. Raspberry Pi model 3B & Pi Zero W still can use on board Bluetooth & WiFi




   RS232 with RJ45 Pin 1  to Pin8  output 


  RS485  with RJ45 Pin 1  to Pin8  output  


     1     2       3       4        5      6      7      8

  4 Port RS232 with standard DB9 output

 4 Port RS485 with 2.54mm pitch 2p header output

  Male DB9 Pin 1  to Pin9  output 




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;
./Pi232 -a ADDR -c CHANNEL -b BAUD -s DEVPTS

./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 115200 Baud run the following;
./Pi232 -a 0x4d -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

./Pi485 -a 0x4c -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



     Enable RS232 in command mode   



  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 RS232 x2 - RS485 x2 
 You will see 2 x Pi232 & 2 x Pi485 run in system 
File Download      

  Software Pack

  User Manual


Package Content

  1x Rs-Pi RS232 - Rs485 Add-On  board

1x manual 



Raspberry Pi

extra UART






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