IC Realtime Specialty: Interrogator DVR - a DVR for law enforcement - Manual (Page 23)

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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 note this series product adopts ground alarm: When alarm circuit connects
to ground you can activate an alarm.
Alarm input and alarm output description ：
a) In alarm 1, from the left to the right are alarm1 to alarm 4 respectively. The
alarm becomes activated in low voltage.
b) In alarm1, 1-No c is normal open activation output. In alarm 2, 2-NO C NC is a
group of normal close activation output.
c) +12V is external alarm input. Here needs an external device to provide +12V
power. The alarm device power shall be less than 1A,
d) A.B is A/B cable to control 485 device. You can connect to control decoder and