I am having a RUTX50 backed by a BAT120. I was hoping, that when power fails, I can use the BAT120 to gracefully shutdown the RUTX50, so that also the batteries are not drained more then necessary. But there does not seem to be a way to cut off the RUTX50 from power by command. "shutoff" and "halt" lead to a reboot and then normal operation again draining the batteries of the BAT120 again.
What is the concept of this setup, if this is not possible? Do I really need an external relay to solve this?