a friend gave me an old apc smart-ups 1250 it has a rs232 interface but i have no pc with a rs232 port i attempted to use a rs232 to usb adapter but the ups goes nuts i connected the ups to batteries and verified it was working properly when i plug the usb cable into the pc the ups shuts down when i attempt to turn it on it beeps twice and shuts down this all occurs before i start the nut software other than give up or buy a new ups, any suggestions
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