Serial ports have two wiring standards DTE (data Terminal equipment) and DCE (data Communication equipment), with the data pins and transmit enables swapped.
Connecting DTE to DCE you use a straight-through cable; here both are DTE so you need a crossover or "null modem" cable. On Thu, Dec 4, 2014 at 6:08 PM, Michael Mounteney <[email protected]> wrote: > OK, not an OmniOS matter but as a lot of people here will be using > UPSs, I hope it's alright. > > I made what is apparently the common but incorrect assumption that the > serial monitoring port on the back of my APC 700 UPS had a standard > serial pinout but for some reason the TxD and RxD are swapped. Is this > just some random brain-&*^# on the part of an android within APC, or is > there some actual reason for it? > > Don't plug a standard serial cable into the UPS: it instantly powers > off. No fooling. > > This is the first step in getting UPS software monitoring in place. I > presume that the software of choice is NUT? I can't find it in a > repo so I suppose it's a build-it-yourself job. > > Michael. > _______________________________________________ > OmniOS-discuss mailing list > [email protected] > http://lists.omniti.com/mailman/listinfo/omnios-discuss >
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