This high speed 4xUART media box provide RS232 x4 /RS485 x4  for device control, the device speed can up to 921600 for each port. 

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

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)

Software Pack   User Manual