Can The Alarm Input Trigger A Camera To Start Recording In An Amcrest AI NVR?

The alarm input (magnetic contact) can trigger a camera to start recording on an Amcrest AI NVR. This is commonly referred to as an alarm linkage. Before proceeding, please make sure to connect the magnetic contact to the alarm input on the NVR. For more information on how to set the NVR to trigger a recording using alarm input, please refer to the information provided below. 

Step 1: Ensure the magnetic contacts are connected to the alarm port on the NVR. This may vary model to model as not all models support this function. However, a representation of this connection is provided below using an NV4416E-AI. 

Alarm Relay Specifications

Contact Material Silver  
Rating (Resistance Load

Rated switch capacity

Maximum switch power

Maximum switch voltage

Maximum switch current

30VDC2A, 125VAC 1A

125VA 160W

250VAC, 220VDC



Between contacts with same polarity

Between contacts with different polarity

Between contacts and winding

1000VAC 1 minute

1000VAC 1 minute

1000VAC 1 minute

Surge Voltage Between contacts with same polarity 1500V (10x160us)
Length of open time 3ms max  
Length of close time 3ms max  



50 x 106 MIN (3Hz)

200 x 103 MIN (0.5Hz)

Temperature -40°F - 158°F  

There are two alarm input types: NO/NC.

An alarm input type on a Amcrest NVR refers to the type of connection that the alarm input uses. There are two types of alarm input types on a Amcrest NVR:

  • Normally Open (NO): This type of alarm input is activated when the two wires are disconnected. This is the most common type of alarm input.
  • Normally Closed (NC): This type of alarm input is activated when the two wires are connected. This type of alarm input is less common, but it is sometimes used in applications where it is important to detect when the alarm is triggered, even if the power is lost.

When connecting an alarm sensor to a Amcrest NVR, it is important to make sure that the alarm sensor is compatible with the alarm input type of the NVR. Most alarm sensors will be labeled with the type of alarm input that they use.

When connect the ground port of the alarm device to the NVR, you can use any of the GND ports.

Connect the NC port of the alarm device to the alarm input port (ALARM) of the NVR.

When there is peripheral power supplying for the alarm device, please make sure it is grounded

to the NVR.

Step 2: Once connected, log into the NVR directly or using the NVR's web user interface (web UI) using a web browser and select Alarm from the main menu. For more information on how to access the web UI for your device, click here.

Step 3: Select Alarm In and make sure the option is enabled on the selected channel and select Record Channel

Screenshot 2023-09-08 122414.png

Note: Ensure the Device Type is set to the proper alarm input type based on the connection of the alarm input wiring. 

Step 4: Navigate to the Video Detection (or applicable rule) and ensure the local alarm is enabled in the alarm output menu. Click OK.

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