Samsung SVR-440 - Manual (Page 24)

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3.2.4 External Connector
Alarm Input(ALARM IN)
This external sensor connection terminal transfers data from the connected sensor or device to the
unit.
Relay Output(RELAY OUT)
This Alarm Output terminal uses the contact relay for the alarm output to the external devices. You
can select NO (Normal Open), CM (Common) or NC (Normal Close) for connection according to the
contact point status.
The operation of each relay output can be defined by a combination of Motion Detect,
Sensor in the Event Setting on the Main Menu. See Paragraph ‘4.5.3 CH1~CH4’ Relay
Setting for details