The purchased UPS 20KVA is a 232 interface. Can it be converted to 485 interface? Do you still need to change the software?
Sure, go to the computer city or somewhere and buy a line that can convert 485. This cable must have a driver. Then when debugging the UPS host, connect the standard cable to the UPS host, connect the cable you bought to the standard cable port, and connect the port 485 to the computer. UPS will jump if the standard line of the host computer is not used. I hope it helps you.