High Speed 4x UART - RS232 x4 /RS485 x4 with Raspberry Pi 4B




1. Provide RS232 x4 / RS485 x4   RJ45 output
2. Can upgrade to  RS232 x8 / RS485 x8
3. Each port Baud Rate can up to 921600
4. Use 4x FT232RL for each port to make sure each port got best performance.
    not use FT4232HL one chip to 4 port.
5. Use 4x Pogo Pin connect to USB signal, no need to use external USB cable.
    no soldering required, easy to use, just plug-in Pi4 with 4 screws.
6. On board DS18B20 1Wire Temperature sensor
7. Provide 8 GPIO control LED
8. 1 GPIO 5V Mini Fan control pin (ON/OFF control ) ( 2.0mm / 2.54mm pitch )
9. On board RTC function with CR1220 Battery socket
10. 4 UART  Board Power select jumper from Pi or Micro USB
11. 5V Mini Fan Power select jumper from Pi or Micro USB
12. Provide DC fan control & Temp detect demo python program GUI interface
13. It provides an individual 3.3V power for UART Board
14. Provide 24C32 HAT EEPROM (i2c-0) for future driver program update.
15. Provide 24C32 EEPROM (i2c-1) for future function use.
16. One software control Micro Switch for Program ( Shut Down , reboot....)
17. Use 20x2 40pin cable connect to Pi
18. PCB size 195mm x 85mm
19. Metal Box size 200mm x 125mm x 55mm
20. Metal Box with 80mm x80mm & 50mm x50mm fan screw hole
21. Raspberry Pi model 4B still can use on board Bluetooth & WiFi



4xUART RS232 x4 with Pi4B 4GB - boot up &  initial 4 port



  8xUART Box  - RS232 x8, loop testing, COM1-COM2, COM3-COM4, COM5-COM6, COM7-COM8

                                                    RJ45 to DB9  (RS232/RS485 )  cable



 This port signal connect to on board USB Hub, can't use external device.


ls /dev

you will find ttyUSB0/ttyUSB1/ttyUSB2/ttyUSB3 in system




   cutecom will detect 4 com port in system can be each to use 4 COM port


ttyUSB0/ttyUSB1/ttyUSB2/ttyUSB3 in system each port baud rate up to 921600


Provide DC fan demo program with Temperature detect and trigger Temperature setting



Support 1.5 inch RGB OLED Connecter

(Part No.: SKU14747 128x128)



   RS232 with RJ45 Pin 1  to Pin8  output 


  RS485  with RJ45 Pin 1  to Pin8  output  

  XXX  XXX   D+  GND   XXX  XXX   D-   XXX

     1     2       3       4        5      6      7      8

   Technical specifications 


 Bus Type: USB 2.0 Chipset ID: FTDI - FT232RL
 Interface: Serial Port Style: Internal USB Hub
 Port Numbers: 4

 FIFO:32 Bytes Max Baud Rate:921.6 Kbps
 Serial Protocol:RS-232/485

 Connector Type(s):1-USB Micro USB (5 pin)
 Female External Ports:4 x RJ45

 System Requirements
 Linux 4.11.x to 5.4.x Versions

 Humidity: 5~85% RH
 Operating Temperature: 0C to 70C (32F to 158F)
 Storage Temperature: -20C to 85C (-4F to 185F)


  File Download      

  Software Pack

  User Manual


Package Content

  1x Rs-Pi 4B RS232x4 / RS485x4  High Speed 4xUART board

1x Metal box  (L-200mm x W-125mm x H-55mm )

1x Pi 4B (4GB) with 16 GB Micro SD card ( include driver & demo program)

  1x 80 mm x 80 mm  DC fan

4x RJ45 to DB9 - 25cm  cable

  1x manual 



Raspberry Pi

extra UART




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