DVR systems NVR38xx Series - Manual (Page 20)

20
Port Name Connection Function
NO1～NO3 1-3-ch alarm
output port
 3 groups of alarm output ports. (Group 1：
port NO1～C1,Group 2:port NO2～
C2,Group 3:port NO3～C3）).Output alarm
signal to the alarm device. Please make
sure there is power to the external alarm
device.
NO：Normal open alarm output port.
 C：Alarm output public end.
C1～C3
A RS485
communication
port RS485_A port. It is the cable A. You can
connect to the control devices such as speed
dome PTZ.
B RS485_B.It is the cable B. You can connect to
the control devices such as speed dome PTZ.
Power port Input 12V DC.
Power button Power on/off button.
2.2.2 2 U Series
The 2U series rear panel is shown as below. See Figure 2-4.
Figure 2-4
Please refer to the following sheet for detailed information.
Port Name Connection Function
Power button Power on/off button.
Power input port Input AC 220
MIC OUT Audio output
port RCA Audio output port. Output analog audio signal to
the devices such as sound box.
MIC IN Audio input port RCA Bidirectional talk input port. Receive the analog
signal from the devices such as speaker or
pickup.