1 VIDEO IN BNC connectors for analog video input
2 VIDEO OUT BNC connector for video output.
3 AUDIO IN RCA connectors for analog audio input
4 LINE IN RCA connector for audio input
5 AUDIO OUT RCA connector for audio output
6 LAN Connector for LAN (Local Area Network)
7 VGA DB15 connector for VGA output. Display local video output and menu
8 USB Connector for USB devices
9 RS-232 Interface DB9 connector for RS232 devices
10 ALARM IN Connector for alarm input
ALARM OUT Connector for alarm output
RS-485 Interface Connector for RS-485 devices. T+, T- pin connects to PTZ
11 POWER Switch for turn on/off the device
12 12V 12VDC power supply
13 GND Ground(needs to be connected when DVR starts up)