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5. Alarm input type unlimited
The DVR alarm output port is constant opening type.
(1) alarm input (2) grounding (3) RS232 (4) alarm output (5) RS485
Parameter Meaning
G grounding (earth)
C1,NO1 Alarm output interface(constant open type)
T,R RS232 port
A,B 485communication interface which is connected with the recording
control equipments such as the decoder
2.6.1 Alarm input port specication
8 channels alarm input. Alarm input type unlimited.
The earth and the com port of the alarm sensor are parallel (The alarm sensor
hasanexternalpowersupply).
The earth of the alarm and the DVR should be shared.
The NC port of the alarm sensor must be connected with the DVR alarm input
port.
The earth of the power supply and the alarm sensor must be shared when used
inexternalpowersupply.
2.6.2 Alarm output port specication
2 channels alarm output. There is an external power supply when using the
externalalarmequipment.
Please refer to the relevant relay parameters to avoid overloading that damages
the DVR.
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