Hi, just today dismantled my PC driven Freenas NAS and connected the UPS to my ReadyNAS 102. On connecting it recognized a UPS being connected, but not the type. After a restart of the NAS everything was recognized fine. I tested the configuration by unplugging the UPS. After a while it nicely brought the NAS down.
So I can confirm the combination APC Back-UPS ES 700 and ReadyNAS 102 (firmware 6.1.7) does function as expected.
Update: after a few months, ReadyNas did not recognize the ups anymore. After a restart sometimes it recognizes that a ups is connected, sometimes it does not recognize anything. Still investigating
