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LED顯xian示shi屏ping是shi采cai用yong發fa光guang二er極ji管guan顯xian示shi出chu相xiang應ying的de顏yan色se並bing以yi之zhi構gou成cheng相xiang應ying的de圖tu像xiang，文wen字zi以yi及ji視shi頻pin等deng相xiang關guan信xin息xi，一yi般ban來lai說shuo，視shi頻pin信xin息xi是shi通tong過guo同tong步bu屏ping進jin行xing播bo放fang，與yu計ji算suan機ji通tong過guo視shi頻pin接jie口kou與yu顯xian示shi屏ping連lian接jie，將jiang顯xian示shi屏ping作zuo為wei計ji算suan機ji的de顯xian示shi器qi處chu理li，圖tu像xiang和he文wen字zi的de顯xian示shi是shi采cai用yong異yi步bu屏ping，計ji算suan機ji通tong過guo數shu據ju通tong信xin接jie口kou與yuLED顯示屏進行數據通信，一般都是通過RS-232/485接口相連接。由於RS-485總線支持一主多從的通信模式，並且其通信距離長，大多LED顯示屏的通信接口多采用RS-485端口。
RS-485總線應用於工業現場環境具有一定的局限性，工業現場電磁環境複雜，而485總線的抗幹擾能力相對較弱，一般來說，工業現場應用光纖通信更加穩定可靠，基於485接口通信的產品利用光纖調製解調器的485轉光纖功能，通過光纖進行數據交換。
某工廠準備在廠區放置一批LEDxianshiping，liyongxianshipingxianshigongchangdeshengchanxinxi，tongzhitonggaodengxiangguanxinxi，youyuxianshixinxixuyaoyidingdeshishixing，xuyaoguankongzhongxinduiduizhenggechangqudexianshipingjinxingtongyiguanli，youyuLED顯示屏本身具有485接口，能夠直接聯網進行統一管理。但是利用485zongxianfushetongxinwangluozhihou，faxianyouyuchangqudedianciganraotailihai，daozhixitongtongxinjibuwending。gongchangjuedingliyongguangxianzuwangzuoweitongxinwangluo，xiwangliyongguangxiantiaozhijietiaoqijiang485chuankouzhuanweiguangxianjiekoujinxingtongxin，danshifaxianshichangshangdedaduoguangxiantiaozhijietiaoqizhinengzhichidianduidiantongxin，yejiushiyouduoshaokuaixianshipingnamejiuxuyaoduoshaoduiguangxiantiaozhijietiaoqipusheguangxianxianlujinxingtongxin，zheyangdaozhichengbenjigaobingqiebuxianyebufangbian。zuihou，gongchangliyongshenzhenshidingxinhongdakejiyouxiangongsidedingzhinenggouzhichiduodiantongxindeguangxiantiaozhijietiaoqidichengbendejiejuelegaiwenti，duodiantongxindeguangxiantiaozhijietiaoqilianjiefangshileisi485總線的手牽手連接方式，A設備的光纖輸出端口接B設備的輸入端口，B設備哦的光纖輸出端口接C設備的輸入端口，依次類推，最後的設備的光纖輸出端口接A設備的光纖輸入端口。從而組成一個單環網絡支持點對多點的通信模式，從而減少了布線成本和設備的成本。
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