I'm far from an expert, but I would not really expect serial to work better. I would try to turn on debugging first.
However, a UPS not reporting line in and line out voltage seems strange.
signature.asc
Description: PGP signature
_______________________________________________ Nut-upsuser mailing list Nut-upsuser@alioth-lists.debian.net https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
