I-View Digi-4800XP 16 channels Hybrid Embedded DVR - Manual (Page 15)

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4.
Series port: Connect to RS-232 device such as Modem.
5.
Printer port: Connect to the printer.
6.
Panic button port: Connect to push button for emergency call. (Dry contact input only)
7.
USB port: Connect to USB device, such as USB external storage device.
8.
LAN port: For TCP/IP connection.
9.
Audio plug: Including Microphone in / Speaker out /Line in..
10.
VGA port: The first Monitor VGA port.
11.
DVI port: The second monitor connection port.
12.
Single video output: The1-16 single video output.
13. Video input: The 16 (17-32) video input.
14. Audio input: 17-32 audio input. (For Digi-3296Pro-Aonly)
15.
Video loop output: The optional 16 (1-16) cameras video loop output.
16. Video loop output: The optional 16 (17-32) cameras video loop output.
17. Video input: The 16 (1-16) video input.
18. Sensor input: 16 sensors input. (For Dry contact input only).
19. Main Monitor 0 output: Display 1-16 spilt video on TV.
20. Main Monitor 1 output: Display 17-32 spilt video on TV.
21.. Relay output: 3 relay output.
22. Audio input: 1-16 audio input. (For Digi-3296Pro-Aonly)
23. Video out: Display 17-32 single video on TV.
24. Spot Monitor 0 output: The optional 16 (1-16) cameras spot monitor 0 output.
25. Spot Monitor 1 output: The optional 16 (17-32) cameras spot monitor 0 output..
The video looping video cannot be used when add the Spot monitor video out.