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D. The RS485 +、- lines of DVR cannot be connected with other RS485 output equipment in parallel.
E.
The voltage between the +、- lines of the decoder must be less than 5V.
4、Front equipment grounding note
Bad grounding can lead to the burnout of the chip.
5、Alarm input type unlimited
The DVR alarm output port is constant opening type.
2.7.1 Alarm input port specification（This feature should be used in conjunction with an external alarm
module. NB: Some models have an optional external alarm module.）
4 channels alarm input. Alarm input type unlimited.
The grounding and the com port of the alarm sensor are parallel (The alarm sensor is external power supply) .
The grounding 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 grounding of the power supply and the alarm sensor must be shared when used in external power supply.
2.7.2 Alarm output port specification（This feature should be used in conjunction with an external alarm
module. NB: Some models have an optional external alarm module.）
1 channels alarm output. There is external power supply when using the external alarm equipment.
To avoid overload and damage to the system, please refer to the relay before the connection, the relay
parameters as defined in the Annex.
NightWatcher D1 Digital Video Recorder User Manual
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