QT-400-4N Manual
QT-400-4N Manual
QT-400-4N Manual
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3.Alarm Connection<br />
The DVR can support up to 4 alarm input and three alarm output.<br />
Alarm input: There are two types of alarm input.<br />
1. Voltage output(5V and 0V)<br />
A: In case sensor output high voltage (5V) normally and<br />
output low voltage when triggered (0V), then users must set DVR<br />
as low voltage alarm.<br />
B: In case sensor output low voltage (0V) normally and<br />
output high voltage when triggered (5V), then users must set DVR<br />
as high voltage alarm.<br />
2. Open/Close output<br />
A: N.O. Normal open,close when triggered. DVR must set as<br />
low voltage alarm.<br />
B: N.C. Normal close,open when triggered,DVR must set as<br />
high voltage alarm.<br />
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