Aposonic A-S1604R20A - Manual (Page 13)

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8. eSATA Connector
Connect this port to external SATA storage device for HDD extension.
9. Ethernet Connector
Connect this unit to a 10/100Base-T Ethernet network through this port.
10. NTSC/PAL Selector Switch
Set this unit to NTSC or PAL according to the local TV system.
11. Main Monitor Output Connector (MAIN OUT Y/C, optional)
Connect TV monitor to the mini-din S-video connector for main monitor
display.
12. Alarm Input Connectors (ALARM IN 1-16, optional)
Connect these connectors to external devices such as sensors or door
switches.
13. Alarm Output Connectors (ALARM OUT 1-4, optional)
Connect these connectors to 2 Normally Closed (NC) alarm outputs (1-2)
and 2 Normally Open (NO) alarm outputs (3-4).
14. 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.
15. Power Input (DC 12V)
Connect to DC 12V power source.
16. Power Switch (POWER)
Turn the power of this unit on/off.