59Relay Output NO/NC/COMThe alarm output can be NO (Normally Open) or NC (Normally Closed), depending on thesettings in the menu.- NO + COM are a normally open circuit. Alarm is triggered when the circuit is closed.- NC + COM are a normally closed circuit. Alarm is triggered when the circuit isopened.6.4 PTZ camera installationConnect the PTZ’s “D+” to the DVR’s “RS 485 D+”, and the PTZ’s “D-“ to the DVR’s “RS485 D-“. After the connection and the related setup are done, users are able to control thePTZ camera using the front panel buttons or included software.NO / NCCOMPOWERSUPPLY+12VGND