I-View Digi-4800XP 16 channels Hybrid Embedded DVR - Manual (Page 13)

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14. Video loop output: The optional 16 (1-16) cameras video loop output.
15. Video loop output: The optional 16 (17-32) cameras video loop output.
16. Video input: The 16 (1-16) video input.
17. Sensor input: 16 sensors input. (For Dry contact input only).
18. Main Monitor 0 output: Display 1-16 spilt video on TV.
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-9600XP-A only).
22. Spot Monitor 0 output: The optional 16 (1-16) cameras spot monitor 0 output.
23. 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-4800XP /Digi-4800XP-A 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.
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)