On Thu, Jul 9, 2020 at 5:00 AM <centos-request at centos.org> 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. > One more possibility that nobody has mentioned yet is to see if the motherboard has a serial port header. Many motherboards still have an actual serial port that doesn't show up on the edge as a 9-pin, but on the board as a 10-pin header. You can get the header adapter for a few dollars (or maybe in your junk drawer). https://www.google.com/search?q=serial+header+adapter Also, I just plugged in a PL2303 based adapter to a CentOS 8 machine yesterday to connect to a Cisco serial console and it just worked. --Rich -- Rich Greenwood Network Engineer Shasta County Office of Education 530-225-0161