User Manual for Commercial Series Net DVRPage 9 Total 1212.3 Rear Panel Description2.3.1 8-ch QSD42208 Rear PanelIndex Physical Interface Description1Video Input Standard BNC.2Loop Back Ports Standard BNC.3Main video Output Connect CCTV monitor, output video and menu.4 VGA Interface VGA display.5RS-232/KeyboardInterfaceConnect RS-232 devices. Refer to Appendix B for pindefinition.RJ45 Ethernet Port Connect network devices. Refer to Appendix B for pindefinition.6Keyboard Interface Can use Hikvision DS-1000K1, DS-1002K1, DS1003K1RS-485 PTZ connection. Using T+/T- to connect PTZ.External Alarm Input 4 sensor alarm in.Relay Output 2 replay output.7 GND Ground8 AC Input 100~240VAC9 E-SATA Optional. Extend 1st internal SATA to E-SATA.