Aposonic A-S1604R20A - 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. Video Out (CALL, MAIN)
Connect TV monitor to the upper BNC connector for call monitor display,
and connect TV monitor to the lower BNC connector for main monitor
display.
3. Audio Input Connectors (AUDIO IN 1-4, optional)
These RCA connectors accept line-in audio signals supplied from external
devices such as microphone amplifiers.
4. Audio Output Connectors (AUDIO OUT, optional)
This connector supplies line-out audio signal to external devices such as
speakers. Recorded audio will be supplied from AUDIO OUT during
playback.
5. RS-232 Connector
Connect this connector to PTZ camera(s), GPS modem, or POS system.
6. HDMI Connector (optional)
Connect HDMI monitor to the HDMI connector for main monitor display.
7. VGA Connector
Connect VGA monitor to the VGA connector for main monitor display.