Aposonic A-S1604R4 - Manual (Page 14)

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Alarm output is Relay Type, Pin 23 is Normal Close and Pin 25 is Normal Open. These
outputs can be used to control external devices.
EXAMPLE 1: Connect with PIR (Passive Infrared) device from ALARM1 INPUT.
EXAMPLE 2: A Normal off (Normal Open) alarm siren at Alarm Output.
EX1 EX2
D-SUB25 PIN DEFINE
1-16 Alarm 1-Alarm 16 Camera alarm input
17-19 N/A
20, 21 GND (connecting to ground)
22 Alarm Reset
23 Alarm output, N.C.
24 Relay COM
25 Alarm output, N.O.