User`s manual

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If the type is NC, this button is normal off. The button becomes off when there is an alarm output.
Figure 2-6
2.5.2 IR Light Connection
Please refer to the following figure for external IR light information. See Figure 2-7.
IR synchronization input signal. When the external IR light is on, the signal cable from the board
outputs the 3.3V/1mA. It outputs the 0V when the IR light is off.
Figure 2-7