How to wire the physical sensor to the Flexidome IP 3000i IR input?

[#1]

According to its Data Sheet, the Flexidome IP 3000i IR camera has 2 options to activate the alarm input.

Step-by-step guide

Please refer to the diagram below if you would like to get alarm input from some physical sensors.

Connect Alarm Input / Output Port:

• Mode A: 
  • Level application: Alarm output high and low level, alarm output is Open Collector (OC);

It needs to increase pull-up resistance externally to work normally. After external pull-up resistance is increased, the default output signal is high level (external pull-up voltage), and it switches to low level when there is alarm output.

• Mode B: 
  • Switch application: Alarm output is used to drive external circuit.