Samsung SRD-476D User Manual page 16

connecting with other device
Connecting the Alarm Input/Output
The Alarm In/Out port at the back is composed of the following.
Connecting alarm inputs
The terminal is used to connect alarm inputs.
One of the (two) signal lines for various sensors is connected to the alarm input number and the other is
connected to the [G] terminal.
Connecting alarm outputs
The terminal is used to connect alarm outputs.
One of the (two) signal lines for external devices is connected to the alarm output terminal and the other is
connected to the [COM] terminal.
16_ connecting with other device
Sensors
Alarm