1. Provide RS232 x8 / RS485 x8   RJ45 output
2. Can upgrade to  RS232 x16 / RS485 x16
3. Each port Baud Rate can up to 921600
4. Use 8x FT232RL for each port to make sure each port got best performance.
    not use FT4232HL one chip to   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

Pi4 with 8xUART  RS232 x8 Port

8x RS232 with Pi4 in metal case

RJ45 to DB9  (RS232/RS485 ) test cable

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

 can be upgrade to 8 UART (RS232 x8/RS485 x8)

   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

   RS232 with RJ45 Pin 1  to Pin8  output