Why did the RDC6563FG controller fail to connect via Ethernet?

Seek help! When I am using the RDC6563FG controller for Ethernet connection, the device still cannot establish normal communication with the computer. After booting up, the controller runs normally and there are no alarm prompts on the screen. However, after connecting to the computer through a network cable, the software still cannot search for the device's IP address. Despite multiple replacements of network cables and switch ports, the problem still persists.