Shenzhen Fostar Electronic Co. Ltd FC2501PA ユーザーズマニュアル

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Figure 4.53
There is an IO alarm input/output interface in the camera rear. Enable IO alarm need this interface to connect 
to the alarm device (door sensor, infrared sensor, smoke detector, etc.). 
Which is the IO alarm output or IO alarm input, please refer to the Installation Guide. 
Setting IO alarm
On the IO page, Enable the I/O alarm, select the “Send E-mail” or ”Snapshot” before you have configured the 
mail or FTP. 
If an IO alarm is triggered and IO alarm output device will always alarm (sound alarm is issued a warning 
sound, alarm lights in flash etc.). Click "Clear IO alarm output" , the alarm output device will stop alarming. If IO 
alarm is triggered again after alarm interval, IO alarm output device will be restart.