IC Realtime Specialty: 4-CH H.264E CUBE REAL-TIME DVR with BUILT-IN 5.6 LCD - Manual (Page 27)

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Figure 3-4
3.7.4 Alarm Output
Do not connect alarm output port directly with high power load (no more than 1 A) in
case of heavy current.
You can use the co-contactor to realize the connection between the alarm output port
and the load.
Please refer to Figure 3-5 for more information.
Figure 3-5
3.7.5 Alarm Input and Output Details
Please refer to Figure 3-6 for AG/AH series alarm input and output information.
The alarm gets activated when the circuit is connected to the ground.