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7. Alarm Input/Output Connection
2 segment alarm type:
Alarm input: input impedance is 22KΩ, window comparation voltage is 0-0.8V. (Explanation: test
the voltage between GND and alarm input, if the value at 0v-0.8v, the host will not alarm, if the
voltage over than 0.8V, the host will alarm) Alarm output: relay (120VAC/1A, 24VDC/1A), Normal
(relay on), alarm (relay off)
3 segment alarm type Alarm input:
Input resistance: 22KΩ, window contrast voltage (3.0V-4.18V). (Note: There will be alarm when
the voltage between 0V-3V or 4.18V-12V, and no alarm when the voltage between 3.0V-4.18V)
Alarm output: Relay (240VAC/7A, 125VAC/10A, 28VDC/10A), normal (relay open), alarm output
(relay close). Sensor power: The machine provides a +12V DC power output port.
Introduce the 3 segment alarm connection as below, the difference between 2 segment alarm and 3
segment alarm is don't need add resistance when use 2 segment alarm type.
1. Alarm sensor connection: Alarm input: The physical connections of the normal on/off mode are
the same. And user can select normal on/off mode in the DVR. Note: The alarm input port which
haven't used should be closed in the DVR. Typical alarm connection: the sensor power supply is
provided by DVR. The fig is as follows:
If the distance between the probe and DVR is too far, the probe requires a separate power
supply: Please connect 2 side to ground if conditional when use separate power, otherwise long
distance transmission maybe make false alarm.
12V power supply
If we parallel connected the sensor, the DVR can not recognize the triggered sensor. User need
to have a resistance.
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