Planet nvr-810 User Manual page 72

interface to the NVR's DI/DO port.
The NVR can receive signal from the UPS when there is a power failure and shut
down itself automatically within a period of time.
Connect UPS with its RS-232 interface to the NVR's 10 port:
* The NVR uses DI_1 to receive signal from UPS system and uses DO_1 to
shut it
d own.