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QT-400-4N Manual

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Alarm output<br />

There are three alarm output pin, the status of these pin are illustrated as<br />

below<br />

Before alarm<br />

N. O.<br />

COM<br />

N. C.<br />

After alarm<br />

There is an example for alarm output connection<br />

N. O.<br />

COM<br />

N. C.<br />

N. O.<br />

COM<br />

N. C.<br />

Alarm<br />

5V<br />

4.Hard Disk Connection<br />

There are several steps to install the hard disk.<br />

Note: If the DVR comes with a HDD, skip the following steps.<br />

29

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