Alarm Input; Alarm Output; Alarm Output Relay Parameters - Dahua DH-XVR5104HS-4KL-I3 User Manual

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NO1 C1, NO2 C2,
NO3 C3
485 A/B

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.
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Parallel connect COM end and GND end of the alarm detector (Provide external power to the
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alarm detector).
Parallel connect the Ground of the DVR and the ground of the alarm detector.
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Connect the NC port of the alarm sensor to the DVR alarm input (ALARM).
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Use the same ground with that of DVR if you use external power to the alarm device.
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4.3.3 Alarm Output

Provide external power to external alarm device.
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To avoid overloading, read the following relay parameters table carefully.
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RS-485 A/B cable is for the A/B cable of the PTZ decoder.
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4.3.4 Alarm Output Relay Parameters

Refer to the actual product for relay model information.
Description
There are four groups of normally open activation output (on/off button).
Ground cable.
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.
Alarm input
Table 4-2 Alarm output relay parameters
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User's Manual