AVer EB3004_MD - Manual (Page 11)

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1.5.3 Connecting the Audio, Sensor and Relay device
The Sensor, Alarm, and audio port enable you to connect 4 sensor inputs, 1 relay outputs,
and 4 audio in and 1 audio out device. Just connect the external sensor, relay, and audio
in/out device pin directly to the pinhole. The RS-232 port can be used for PTZ camera
connection through a RS-232 to RS-485 converter.
Check the table below and locate which pinhole is assigned to sensor input, relay output,
and audio in/out.
The signal from the sensor (i.e., infrared sensors, smoke detectors, proximity sensors, door
sensors, etc.) is being transmitted to the unit and this triggers the system to respond and
send signal to relay device (i.e., alarm, telephone etc).
Audio in and out pinhole:
Pin # Definition
1 Audio input signal
2 Audio Ground signal
3 Audio input signal
4 Audio Ground signal
5 Audio input signal
6 Audio Ground signal
7 Audio input signal
8 Audio Ground signal
9 Audio output signal
10 Audio Ground signal