The Mastervolt inverter Our photovoltaic system communicates via the input serial port of a PC PC.Les more modern with only USB so it needed a gateway serial / USB.Fonctionnement impeccable after driver installation (mini enclosed CD ) .Seul note: the app from my inverter found nothing in COM1.Après testing other ports offered is the COM4 who found connecté.Mais the inverter is probably configurable.