On 07/08/2020 03:02 PM, Fred Smith wrote: > On Wed, Jul 08, 2020 at 01:40:27PM -0500, Chris Adams wrote: >> 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. >> > Another possibility for the Original Poster: > Purchase a serial add-in card from Amazon or Newegg. > last I noticed they weren't expensive. This avoids > the compatibility-hell you may (or may not) encounter > with a USB-to-serial converter. > > Fred > OK, I'll see what fits the machine best.