Dahua 1.5U Series User Manual

Contents

Dahua 1.5U Series User Manual Manual pdf 35 page image

35In the second line,from the left to theright,: 1，2，3，4，5，6，7，8，In the first line, fromthe left to the right:9，10，11，12，13，14，15，16ALARM 1 to ALARM 16. The alarm becomes active in low voltage.In the second line,from the left to theright:NO1 C1，NO2 C2，In the first line, theNO3 C3The three groups of normal open activation outputs(on/off button)Earth cable.485 A/B 485 communication port. They are used to control devices such asPTZ. Please parallel connect 120TΩ between A/B cables if there aretoo many PTZ decoders.3.8.2 Alarm Input PortPlease refer to the following sheet for more information.z 4/8/16-ch grounding alarm inputs. (Normal open or Normal close type)z Please parallel connect COM end and GND end of the alarm detector (Provide externalpower to the alarm detector).z Use the controllable +12V power to reset the smoke sensor remotely.z Please parallel connect the Ground of the DVR and the ground of the alarm detector.z Please connect the NC port of the alarm sensor to the DVR alarm input(ALARM)z Use the same ground with that of DVR if you use external power to the alarm device.Figure 3-83.8.3 Alarm Output Portz The 4 HDD series DVR has 6 ways relay alarm outputs and the 2 HDD series DVR has 3ways relay alarm outputs. (NO contact). Provide external power to external alarm device.z To avoid overloading, please read the following relay parameters sheet carefully.z For controllable +12V, it can be used to provide power to devices such as reset smokesensor.z RS485 A/B cable is for the A/B cable of the PTZ decoder.