User’s Manual
41
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Description
NO1 C1, NO2 C2,
NO3 C3
There are four groups of normally open activation output (on/off button).
Ground cable.
485 A/B
485 communication port. They are used to control devices such as decoder.
120 Ω should be parallel connected between A, B lines if there are too many
PTZ decoders.
4.3.2
Alarm Input
Refer to the following figure for more information.
Grounding alarm inputs which includes NO (Normally Open) and NC (Normally Closed) type.
Parallel connect COM end and GND end of the alarm detector (Provide external power to the
alarm detector).
Parallel connect the Ground of the DVR and the ground of the alarm detector.
Connect the NC port of the alarm sensor to the DVR alarm input (ALARM).
Use the same ground with that of DVR if you use external power to the alarm device.
Alarm input
4.3.3
Alarm Output
Provide external power to external alarm device.
To avoid overloading, read the following relay parameters table carefully.
RS-485 A/B cable is for the A/B cable of the PTZ decoder.
4.3.4
Alarm Output Relay Parameters
Refer to the actual product for relay model information.
Содержание DH-XVR54 L-I2 Series
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