ELRO FA420DVR 4-ch digital recorder + 500 gb hard disc USERS MANUAL - Manual (Page 39)

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4.3.4 Alarm Input
When DVR receives the alarm signal from external alarm devices, it triggers the defined alarm
functions.
Note: Advanced key is the same as the right mouse button.
Figure 4.10 Alarm Input
To set: refer to Chapter 4.3.1 Motion Detection.
4.3.5 Alarm Output
See Chapter 3.5.4 Alarm Output
4.3.6 Exception Handling
Analyze and test certain hardware and software in current system. When detecting exceptional
events, the unit makes corresponding responses such as screen prompt, buzzer beep, etc.