Aposonic A-S1602R20B - Manual (Page 13)

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switches.
10. RS-485 Connector
Connect this connector to RS-422/485 compatible PTZ camera(s) or
keyboard. Please refer to the manuals come with the RS-485 compatible
devices for the correct settings. Please refer to
Appendix C for the
Keyboard Control Protocol for the digital video recorder.
11. Power Input (DC 12V)
Connect to DC 12V power source.
12. Ethernet Connector
Connect this unit to a 10/100Base-T Ethernet network through this port.
13. VGA Connector
Connect VGA monitor to the VGA connector for main monitor display.
14. Video Out (MAIN)
Connect TV monitor to the BNC connector for main monitor display.