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. I
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, 201
On Fri, 5 Dec 2014 09:04:11 +0100
Thomas Wagner wrote:
> Michael,
> I can't say something on the serial connection.
> But I believe that some of the PINs like "carrier detect"
> are used to signal power conditions and in the other direction
> tell the UPS to power on or off.
> Maybe the "null-mod
