42are to receive the signalfrom the external alarmsource. There are two types;NO (normal open)/NC(normal close). When your alarm inputdevice is using externalpower, please make surethe device and the NVRhave the same ground.NO1 C1 ～NO3 C3Alarm output port1～3 3 groups of alarm outputports. (Group 1：port NO1～C1,Group 2:port NO2 ～C2,Group 3:port NO3 ～C3）).Output alarm signal tothe alarm device. Pleasemake sure there is power tothe external alarm device. NO ： Normal open alarmoutput port. C：Alarm output public end.A RS485 (RS-485)communication portRS485_A port. It is the cable A.You can connect to the controldevices such as speed domePTZ.B RS485_B.It is the cable B. Youcan connect to the controldevices such as speed domePTZ.11 Power input port Input DC 12V12 Power switch Power on/off button.13 GND Ground port2.2.3 HCVR52XXLThe 5208L series products’ rear panel is shown as below. See Figure 2-6.
