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I found the link in other threads, the link seems to have gone dead. There used to be a white paper on the NI boards.

Is there a common, known protocol for this type of UPS behavior? (By the way, I found this old thread: Different brand of UPS, different solution.) Thanks, DaveT. And no traffic is evident on the serial port. It doesn't report battery levels or any details. It only reports whether the UPS is on AC power or not and is connected or not. I'm guessing that their software only monitors some of the handshaking lines. It appears that when their software is installed, nothing is going across the serial port. I tried installing their software and snooping.