Rugged Cams Workhorse DVR 4 Channel - Manual (Page 84)

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On the {Recording Setup} {Data 1~4} {Event} {Sensor} menu, go to the channel using
the arrow (STW X) buttons and select the [Main Setup] button. Afterward, right-click
[Sensor].
On the selection box, set the sensor type using the arrow (ST) and [Select] buttons.
Normal Close (NC): Opens in case of incoming signal when closed normally
Normal Open (NO): Closes in case of incoming signal when opened normally
C) Sound
Defines the settings for detecting audio input from an external device compatible with the system
The user can set the audio input for two external devices compatible with the system. Once audio
input is detected, the video of the corresponding channel is recorded. Each channel can detect audio
from up to two devices.
On the {Recording Setup} {Data 1~4} {Event} {Sound} menu, go to the channel using
the arrow (STW X) buttons and press the [Select] button.
To set all channels at the same time, go to {Sound} and press the [Select] button.