EverFocus EDVR 16D1 - Manual (Page 15)

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7. Video In
Connect camera’s video output or other composite video source to the video input connection.
8. Video Out
Connect a CCTV monitor to the video output connection.
9. VGA
Connect a VGA monitor to the VGA output connection.
10. RS232
For DVR serial command control
11. USB 2.0 (back)
USB port allows you to archive video files to USB flash memory device or to connect the mouse.
12. LAN
RJ-45 network connection