I haven't used APC commander... I used the settings within the GUI under: Maintenance --> UPS settings.
To check the log, I proceeded to: System status --> Log information --> System log.
Again, this is what I see in the log:
Aug 20 09:58:00 LONDON-FS01 TeraStation PRO[17066]: [Web] UPS status was changed
Aug 20 09:58:00 LONDON-FS01 TeraStation PRO[17066]: [Web] Change value : ups.ups=
Aug 20 09:58:00 LONDON-FS01 TeraStation PRO[17066]: [Web] Change value : ups.ups_portshutdown=
Aug 20 09:58:00 LONDON-FS01 TeraStation PRO[17066]: [Web] Change value : ups.ups_maker=
The settings in the NAS pane are as follows:
Synchronize with UPS - Enable
UPS Connection Type - UPS dedicated port (APC Style)
Shutdown Condition when Power Failure - Shutdown TS after 60 seconds
UPS Behavior After TeraStation has Shutdown - Alive
UPS Recovery Function - Greyed out