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RS485总线介绍与特色应用发布时间:2017-5-23    被阅览数:次

RS485简介


  福彩3D走势图RS485是由EIA(Electronic Industry Association,美国电子工业协会)于1983年在RS-422基础上制定并发布的一种串行通信平衡式数据发送标准,经通讯工业协会(TIA)修订后命名为TIA/EIA-485-A。满足RS485标准的收发器采用差分传输方式(Differential Driver Mode),数据最高传输速率为10Mbps,最大通信距离约为1219m。


  RS485JUYOUZHICHIDUOJIEDIAN(32GEJIEDIAN),CHUANSHUJULIYUAN(ZUIDA1219m),JIESHOULINGMINDUGAO(200mVDIANYA),LIANJIEJIANDAN(ZAIGOUCHENGTONGXINWANGLUOSHI,JINXUYAOYIDUISHUANGJIAOXIANZUOCHUANSHUXIAN),NENGYIZHIGONGMOGANRAO(CHAFENCHUANSHU),CHENGBENDILIANDENGTEDIAN,ZAIDUOZHAN、YUANJULITONGXINDENGDUOZHONGGONGKONGHUANJINGZHONGHUODELEGUANGFANYINGYONG。


RS485电气与物理特性


  RS485采用平衡发送和差分接收方式,具有抑制共模干扰的能力,加之总线收发器具有高灵敏度,能检测低至200mV的电压,因此RS485的传输距离达到千米以外,是进行远距离串行数据传输的首选方式。


福彩3D走势图  RS485CAIYONGBANSHUANGGONGGONGZUOFANGSHI,RS485JIEKOUZUCHENGDEBANSHUANGGONGWANGLUOCAIYONGPINGBISHUANGJIAOXIANJINXINGXINHAOCHUANSHU,WULISHANGZHIXUERGENLIANXIAN,FEICHANGBIANYUJINXINGDUODIANHULIAN,YISHIXIANYIDUIDUODIANDETONGXUN。RS485JIEKOUZONGXIANKELIANJIE32GEZHANDIAN,JIAZHONGJIQIHOUKELIANJIEDUODA255GEZHANDIAN。


  RS485JIEKOUFASONGDUANYICHAFENXINHAOXIANLIANGXIANJIANDEDIANYACHA+2V ~ +6VBIAOSHILUOJI“1”,-2V ~ -6VBIAOSHILUOJI“0”。


  RS485JIEKOUJIESHOUDUANYICHAFENXINHAOXIANDEABIBGAO200mVYISHANGRENWEISHILUOJI“1”,ABIBDI200mVYISHANGRENWEISHILUOJI“0”。


  RS485JIEKOUXINHAODIANPINGBIRS232DI,BUYISUNHUAIJIEKOUDIANLUXINPIAN,TONGSHIRS485JIEKOUXINHAODIANPINGYUTTLXINHAODIANPINGJIANRONG,BIANYULIANJIETTLDIANLU。


  RS485SHUJUZUIGAOCHUANSHUSULVWEI10Mbps,DANSHIKAOLVDAOXUYAOLIANJIEGEZHONGBUTONGJIEKOU(RURS232DENG)DESHEBEI,ERGUOGAODECHUANSHUSULVHUIJIANGDICHUANSHUJULI,SUOYISHIJIYINGYONGZHONGCHUANSHUSULVWANGWANGSHEZHIWEI9600bpsHUOGENGDI。


  RS485JIEKOULIANJIEQICAIYONGDB9DE9XINCHAZUOHUOHT508CHAZUOSHIDUANZI,SHEBEILIANJIEJIANDAN。


RS485电路特点


  RS485接口为半双工接口,采用双向单信道主/从通信方式,在同一时刻只能有一个站点作为主机发送数据,而其它站点均作为从机处于接收状态,以免发生总线竞争冒险。因此,RS485发送电路必须由使能信号(RTS#或RTSn)加以控制。


  XIATUSHIYIGEDIANXINGDERS485JIEKOUKONGZHIDIANLU。YOUTUZHONGKEJIAN,SHUJUSHOUFAHESHINENGKONGZHI(TUZHONGWEIRTSnKONGZHI)FENKAIJINXING,SHUJUSHOUFADUANFENBIEYONGGUANGDIANGELIQIJIANJINXINGBAOHU,ERJIEKOUDUANSHIYONGLEBAOXIANSIYIBAOHUJIEKOUXINPIAN。


RS485总线介绍与特色应用.gif

典型的带收发控制和保护电路的RS485原理图


RS485总线介绍与特色应用.gif

英创ESMARC开发评估底板上的RS485电路部分


RS485在英创主板平台上的应用


福彩3D走势图  YINGCHUANGZHUBANKEYITONGGUOZHUBANZIDAIHEWAIKUOGONGNENGMOKUAI,ZHICHIHEGUANLIDUODAJISHILUDECHUANKOUTONGXIN。JIYUQIANMIANTIDAODETEDIAN,ZAIGONGYEYINGYONGZHONG,CHUANKOUJINGCHANGSHIYIRS485DEFANGSHIJINXINGLIANJIEHESHIYONG。LINIANLAI,DALIANGYONGHUSHIYONGYINGCHUANGZHUBANJINXINGDUOCHUANKOUGUANLIHESHUJUCHULIYUZHUANFA,YINGCHUANGYELEIJILEFENGFUDEGONGCHENGJINGYAN。XIAMIANZHENGLICHULEYINGCHUANGWANGZHANFABIAODEXIANGGUANJISHUWENDANGGONGYONGHUCANKAO。SUIRANYOUYIXIEFANGANWENDANGZHONGTIDAODEYINGCHUANGZHUBANSHIJIAOLAODEXINGHAO,YONGHUZAIXINCHANPINKAIFADESHIHOUWEIBIHUISHIYONGZHEIXIELAOZHUBANCHANPIN,DANSHIWENZHONGDERUANYINGJIANSHIYONGJIQIAO、BIANCHENGJIQIAOHEFANGFADENGJISHUXIJIE,SHIZHIDEYONGHUCANKAOHUOZHEZHIJIESHIYONGDE。


  应用方案

  
  
  
  
 
 


  使用方法与技巧

  
  
  
  
  
  
  
  
  
  
 
 
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