Aposonic A-S1602R20B - Manual (Page 12)

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2.2 Back Panel
1. Video Input Connectors (1-16)
Connect system cameras to these BNC connectors. The internal 75Ω
termination is always ON.
2. Audio Output Connectors (AUDIO OUT)
This connector supplies line-out audio signal to external devices such as
speakers. Recorded audio will be supplied from AUDIO OUT during
playback.
3. HDMI Connector (optional)
Connect HDMI monitor to the HDMI connector for main monitor display.
4. eSATA Connector
Connect this port to external SATA storage device for HDD extension.
5. Audio Input Connectors (AUDIO IN 1-4, optional)
These RCA connectors accept line-in audio signals supplied from external
devices such as microphone amplifiers.
6. RS-232 Connector
Connect this connector to PTZ camera(s), GPS modem, or POS system.
7. I/R Extension Connector (I/R, optional)
Optional I/R extension connector to receive signal from I/R remote
controller.
8. Alarm Output Connectors (ALARM OUT 1-2)
Connect these connectors to 1 Normally Closed (NC) alarm output (1) and
1 Normally Open (NO) alarm output (2).
9. Alarm Input Connectors (ALARM IN 1-8)
Connect these connectors to external devices such as sensors or door