Once upon a time, John Pierce <jhn.pierce at gmail.com> said: > yes, but is it 'basic serial UPS' or is it 'enhanced serial UPS' ? the > former do NOT use the rx/tx data of the serial port at all, they ONLY use > the serial port control signals, and they probably will NOT work with a > USB port because they require very specific behavior from those signals at > power up and reboot times. I've used various serial devices, including UPSes, via various USB-to-serial adapters (Prolific PL2303 and FTDI FT2232C), and all the signaling works fine. Only issue you sometimes have is that there are many cheap adapters on Amazon that claim to be Prolific or FTDI but are in fact counterfeit clones - those may or may not work reliably for ANY purpose. -- Chris Adams <linux at cmadams.net>