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開關量指的是觸點“斷開”和“閉合”deliangzhongzhuangtai，kaiguancunzaiyugezhongdianqishebeidangzhong，liyongkongzhikaiguanliangdeduankaihebihedezhuangtailaikongzhixiangyingdianqishebeideyunxingzhuangtai。kaiguanliangdexiangguanzhuangtaidekongzhihecaijiyejiuxiangyingdejichengjinrulexiangguandexitongdangzhong，biruzidonghuakongzhixitong，fangdaobaojingxitongdeng。
在zai很hen多duo係xi統tong中zhong，總zong會hui出chu現xian相xiang應ying的de開kai關guan相xiang互hu聯lian動dong的de要yao求qiu，即ji要yao求qiu某mou個ge開kai關guan一yi旦dan啟qi動dong或huo者zhe斷duan開kai，另ling外wai的de開kai關guan也ye要yao發fa生sheng相xiang應ying的de變bian化hua，即ji需xu要yao實shi現xian遠yuan程cheng開kai關guan聯lian動dong模mo式shi。如ru果guo兩liang個ge開kai關guan相xiang互hu距ju離li比bi較jiao近jin的de話hua，直zhi接jie接jie線xian就jiu可ke以yi實shi現xian該gai功gong能neng，而er當dang距ju離li超chao過guo一yi定ding的de程cheng度du則ze需xu要yao開關量輸入輸出模塊來進行轉接。
某mou小xiao區qu防fang盜dao報bao警jing係xi統tong，管guan理li處chu通tong過guo在zai周zhou邊bian設she置zhi防fang盜dao報bao警jing裝zhuang置zhi防fang範fan非fei法fa入ru侵qin，利li用yong紅hong外wai防fang盜dao模mo式shi進jin行xing布bu防fang，一yi旦dan發fa現xian有you人ren非fei法fa闖chuang入ru，紅hong外wai報bao警jing係xi統tong啟qi動dong聲sheng光guang報bao警jing器qi進jin行xing報bao警jing，提ti示shi小xiao區qu保bao安an過guo來lai處chu理li，但dan是shi在zai實shi際ji應ying用yong中zhong發fa現xian，由you於yu小xiao區qu範fan圍wei比bi較jiao大da，保bao安an巡xun邏luo的de範fan圍wei比bi較jiao廣guang，如ru果guo正zheng巧qiao巡xun邏luo至zhi遠yuan離li報bao警jing區qu域yu，並bing不bu一yi定ding能neng夠gou實shi時shi發fa現xian非fei法fa入ru侵qin，並bing且qie由you於yu報bao警jing器qi聲sheng音yin較jiao大da，夜ye晚wan出chu現xian誤wu報bao情qing況kuang容rong易yi形xing成cheng投tou訴su。管guan理li處chu希xi望wang能neng夠gou將jiang報bao警jing器qi的de開kai關guan量liang信xin號hao傳chuan輸shu至zhi監jian控kong中zhong心xin，一yi旦dan發fa現xian異yi常chang情qing況kuang，對dui監jian控kong中zhong心xin報bao警jing，保bao證zheng監jian控kong中zhong心xin能neng夠gou及ji時shi協xie調tiao處chu理li情qing況kuang。由you於yu距ju離li較jiao遠yuan，直zhi接jie拉la線xian至zhi監jian控kong中zhong心xin並bing不bu能neng實shi現xian紅hong外wai防fang盜dao係xi統tong與yu報bao警jing器qi的de聯lian動dong，利li用yong深shen圳zhen市shi鼎ding信xin鴻hong達da科ke技ji有you限xian公gong司si的de開kai關guan量liang輸shu入ru輸shu出chu模mo塊kuai可ke以yi解jie決jue該gai問wen題ti，利li用yong開kai關guan量liang模mo塊kuai采cai集ji紅hong外wai防fang盜dao係xi統tong的de開kai關guan量liang信xin號hao，通tong過guo485總線進行傳輸至監控中心的開關量模塊，由於中間采用485總線傳輸信號，傳輸距離可以達到1200米mi，一yi旦dan遠yuan端duan的de開kai關guan量liang信xin號hao發fa生sheng變bian動dong，則ze監jian控kong中zhong心xin的de開kai關guan量liang模mo塊kuai的de控kong製zhi接jie口kou的de繼ji電dian器qi同tong時shi發fa生sheng變bian化hua，啟qi動dong報bao警jing器qi進jin行xing報bao警jing。通tong過guo開kai關guan量liang輸shu入ru輸shu出chu模mo塊kuai，實shi現xian了le通tong過guo485總線控製遠程開關聯動。
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