一種基于BACnet的WebCCTV系統(tǒng)設(shè)計

Abstract

Inthispaper,aBACnet-basedWebCCTVsystemisproposed,whichisaimedtoprovideaneasy-to-use,scalableandinteroperablesolutionforsurveillanceandsecuritymanagement.ThesystemutilizesBACnetprotocoltoestablishcommunicationbetweendifferentsubsystems,monitorsanddevices,andprovidesawebinterfaceforuserstoaccessandcontrolthesystem.Theproposedarchitectureanddesignprinciplesarediscussed,andaprototypeimplementationispresented.

Introduction

Asthesecuritythreatsbecomemorediverseandcomplex,itiscrucialtodeployeffectivesurveillanceandsecuritysystemstoprotectpeopleandassets.TraditionalCCTVsystemshavebeenwidelyusedfordecades,buttheyhavesomeinherentlimitations,suchaslowscalability,lackofinteroperability,andpoorintegrationwithotherbuildingsystems.Meanwhile,theemergenceofInternetofThings(IoT)technologieshasbroughtnewopportunitiestodevelopinnovativeandsmartsecuritysolutions.

BACnetisanANSI/ASHRAEstandardprotocolthathasbeenwidelyusedinbuildingautomationandcontrolsystems(BACS)forover25years.Itprovidesastandardizedcommunicationinterfacefordifferentdevicesandsystems,enablingseamlessintegrationandinteroperability.WebCCTVisanewapplicationareathatutilizeswebtechnologiestoaccessandcontrolCCTVsystemsthroughtheinternet.Itoffersmanyadvantages,suchasremotemonitoring,centralizedmanagement,andeasyaccessforauthorizedusers.

Inthispaper,weproposeaBACnet-basedWebCCTVsystemthatleveragestheadvantagesofbothBACnetandwebtechnologies.ThesystemenablesdifferentCCTVsubsystemsanddevicestocommunicatewitheachotherthroughBACnet,andawebinterfaceisprovidedforuserstoaccessandcontrolthesystem.Thesystemarchitecture,designprinciples,andimplementationarediscussedindetail.

SystemArchitecture

TheproposedWebCCTVsystemconsistsofthreemainlayers:thephysicallayer,thenetworklayer,andtheapplicationlayer.Atthephysicallayer,thesystemincludesCCTVcameras,videorecorders,and

otherdevices.Atthenetworklayer,theBACnetprotocolisutilizedtoestablishcommunicationbetweendifferentdevicesandsubsystems.Theapplicationlayerprovidesawebinterfaceforuserstoaccessandcontrolthesystem.

Figure1:BACnet-basedWebCCTVSystemArchitecture

TheBACnetprotocolisusedtoconnectdifferentsubsystemsanddevicesinthesystem.Thesystemcanbedividedintodifferentareas,eachwithitsownsubnetandBACnetrouter.Theroutersareresponsibleforroutingmessagesbetweendifferentsubnetsandallowingdevicesindifferentsubnetstocommunicate.BACnetobjects,suchasanaloginput/output,binaryinput/output,andschedule,areusedtorepresentdifferentdevicesandcontrolsinthesystem.

ThewebinterfaceisdevelopedusingmodernwebtechnologiessuchasHTML5,CSS,andJavaScript.ThewebapplicationcommunicateswiththeBACnetnetworkthroughamiddlewarelayer,whichtranslatesthewebcommandsintoBACnetmessagesandviceversa.Thewebinterfaceprovidesvariousfunctionalities,includingliveviewing,recordingplayback,cameracontrol,eventnotification,andusermanagement.

DesignPrinciples

SeveraldesignprinciplesarefollowedindevelopingtheWebCCTVsystem,includingopenness,scalability,flexibility,andsecurity.

Openness

TheWebCCTVsystemisdesignedtobeopenandinteroperable.ItutilizestheBACnetprotocol,whichisanopenstandard,toestablishcommunicationbetweendifferentsubsystemsanddevices.Thisenablesseamlessintegrationwithotherbuildingsystems,suchasHVAC,lighting,andaccesscontrolsystems.Thewebinterfaceisalsodesignedtobeaccessiblefromanyweb-enableddevice,suchasdesktops,laptops,tablets,andsmartphones,usingstandardwebbrowsers.

Scalability

TheWebCCTVsystemisdesignedtobescalable,whichmeansitcanaccommodategrowingdemandsandrequirements.ThesystemcanbeeasilyexpandedbyaddingnewdevicesandsubsystemstotheBACnetnetwork.Newsubnetscanbecreatedtoaccommodatenewareasorbuildings.Thewebinterfaceisdesignedtobemodularandextensible,whichallowsnewfunctionalitiesandfeaturestobeaddedtothesystem.

Flexibility

TheWebCCTVsystemisdesignedtobeflexible,whichmeansitcanadapttodifferentuserneedsandscenarios.ThesystemsupportsvariousCCTVcameramodelsandtypes,whichcanbeconfiguredandcontrolledthroughthewebinterface.Theeventnotificationsystemisalsoconfigurable,whichallowsuserstodefinedifferenteventsandtheirassociatedactions,suchassendingemailorSMSalerts,triggeringalarms,orrecordingvideos.

Security

TheWebCCTVsystemisdesignedtobesecure,whichmeansitprotectssensitivedataandpreventsunauthorizedaccess.TheBACnetprotocolsupportsauthenticationandencryption,whichensuresthatonlyauthorizedusersanddevicescanaccessandmodifythesystem.Thewebinterfacealsosupportsuserauthenticationandaccesscontrol,whichallowsadministratorstodefinedifferentuserrolesandpermissions.

PrototypeImplementation

AprototypeimplementationoftheBACnet-basedWebCCTVsystemisdevelopedtodemonstratethefeasibilityandeffectivenessoftheproposedarchitectureanddesignprinciples.TheprototypesystemconsistsofseveralCCTVcameras,avideorecorder,aBACnetrouter,andawebserver.

Figure2:PrototypeImplementationoftheBACnet-basedWebCCTVSystem

ThevideorecorderandcamerasareconnectedtotheBACnetnetworkthroughaBACnetrouter.Thewebserverhoststhewebapplicationandmiddlewarelayer.ThemiddlewarelayercommunicateswiththeBACnetnetworkthroughtheBACnetApplicationProgramInterface(API)providedbytheBACnetprotocolstack.

Thewebinterfaceprovidesseveralfunctionalities,includingliveviewing,recordingplayback,cameracontrol,eventnotification,andusermanagement.TheliveviewingandrecordingplaybackareimplementedusingHTML5videoandvideo.jslibrary.ThecameracontrolisimplementedusingJavaScriptandAJAXtechniques.Theeventnotificationsystemis