Q-See QSD6204 - Manual (Page 12)

C. Sensor Installation
The DVR can support up to 4 sensors (not included in the DVR package) in up to four
locations.
There are two steps for sensor installation:
(a)
Connect the sensor signal lines to the signal input terminal.
(b)
Connect the sensor power lines to the appropriate power source.
In general, there are three different types of sensors readily available for purchase:
(1) Normal-Close (2) Normal-Open (3) Normal
[DVR-Sensor installation Diagram]
Close/Open. Below is a brief diagram on how each type of sensor is installed into the
DVR. The procedure for sensor installation is shown below:
Notice:
*After you install sensor(s), the programmed recording mode must be set to “S”
for “sensor” during the hour that you are recording (See “Chapter 5.H.Record
Schedule”).
*Contact an authorized dealer for information about buying the appropriate
sensors for your needs and for information concerning proper installation
procedures.
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