Vivotek ND9542P 32-Channel 4K UHD NVR (No HDD) - Manual (Page 139)

VIVOTEK - Built with Reliability
User's Manual - 139
You should also configure a corresponding alarm on the VAST server. Enter the Alarm
management window. Select System Event and begin your configuration.
Select NVR and a triggering condition, such as the GPS diconnect, as your trigger.