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  

   Technical specifications 

 HARDWARE

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

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

 CONNECTOR(S)
 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

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