I-View Digi-4800XP 16 channels Hybrid Embedded DVR - Manual (Page 17)

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19. Main Monitor 1 output: Display 17-32 spilt video on TV.
20.. Relay output: 3 relay output.
21. Audio input: 1-16 audio input. (For Digi-3248Pro-Aonly)
22. Video out: Display 17-32 single video on TV.
23. Spot Monitor 0 output: The optional 16 (1-16) cameras spot monitor 0 output.
24. 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.
Digi-1648 Pro Back Panel Description:
1.
Power plug: Plug power cable.
2.
Power switch: Turn on/off power supply.
3.
RS-485 Port: The communication port to control the Speed Dome and P/T/Z camera.
4.
Printer port: Connect to the printer.
5.
Series port: Connect to RS-232 device such as Modem.
6.
Panic button port: Connect to push button for emergency call. (Dry contact input )
7.
USB port: Connect to USB device, such as USB external storage device.
8.
LAN port: For TCP/IP connection.
9.
Audio plug: Including Mic in / Speaker out /Line in.
10.
VGA port: The first Monitor VGA port.
11.
DVI port: The second monitor connection port.