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RS232、RS485、RS422、RJ45接口的区别和各自的应用。

发布时间:2018-01-18 浏览次数:365

RS-232、RS-422与RS-485都是串行数据接口标准,RS-232是PC机与通信中应用最广泛的一种串行接口。RS-232被定义为一种在低速率串行通讯中增加通讯距离的单端标准。RS-232采取不平衡传输方式,即所谓单端通讯,而RJ45接口通常用于数据传输,最常见的应用为网卡接口。下面就由硕凌电子介绍一下:

RS-232SHIWEIDIANDUIDIAN(JIZHIYONGYIDUISHOU、FASHEBEI)TONGXUNERSHEJIDE,QIQUDONGQIFUZAIWEI3~7kΩ。SUOYIRS-232SHIHEBENDISHEBEIZHIJIANDETONGXIN。

422YURS-485CHUANXINGJIEKOUBIAOZHUN,RS-422、RS-485YURS-232BUYIYANG,SHUJUXINHAOCAIYONGCHAFENCHUANSHUFANGSHI,YECHENGZUOPINGHENGCHUANSHU,TASHIYONGYIDUISHUANGJIAOXIAN,ZAIZAOQIPCTONGXINZHONGBIJIAOCHANGJIAN,RS-422DEZUIDACHUANSHUJULIWEI4000YINGCHI,ZUIDACHUANSHUSULVWEI10Mb/s

RS-485YURS-422YIYANG,QIZUIDACHUANSHUJULIYUEWEI1219MI,ZUIDACHUANSHUSULVWEI10Mb/s。PINGHENGSHUANGJIAOXIANDEZHANGDUYUCHUANSHUSULVCHENGFANBI,ZAI100kb/sSULVYIXIA,CAIKENENGSHIYONGGUIDINGZUIZHANGDEDIANLANZHANGDU。ZHIYOUZAIHENDUANDEJULIXIACAINENGHUODEZUIGAOSULVCHUANSHU。YIBAN100MIZHANGSHUANGJIAOXIANZUIDACHUANSHUSULVJINWEI1Mb/s。

ZHEIXIEYIBUCHUANXINGTONGXUNJIEKOUDOUYINGYONGYUJISUANJICEKONGXITONGZHONG,RS232C SHIMEIGUODIANZIGONGYEXIEHUIZHENGSHIBUDECHUANXINGZONGXIANBIAOZHUN,YESHIMUQIANZUICHANGYONGDECHUANXINGJIEKOUBIAOZHUN,YONGYUSHIXIANJISUANJIYUJISUANJIZHIJIAN、JISUANJIYUWAISHEZHIJIANDESHUJUTONGXUN。RS232CCHUANXINGJIEKOUZONGXIANSHIYONGYU:SHEBEIZHIJIANDETONGXUNJULIBUDAYU15MI,CHUANSHUSULVZUIDAWEI20kB/s。

YIGEWANZHENGDERS232CJIEKOUYOU22GENXIAN,CAIYONGBIAOZHUNDE25XINCHATOUZUO。RS232CCAIYONGLUOJI,LUOJI“1”:-5V~-15V,LUOJI“0”:+5V~+15V

QUEDIAN:SHUJUCHUANSHUSUDUMAN、TONGXUNJULIDUAN、WEIGUIDINGXIAOZHUNDELIANJIEQI、JIEKOUCHUGEXINHAOJIANYICHANSHENGCHUANRAO。

1、RS-232是美国电子工业协会EIA(ElectronIC Industry Association)制定的一种串行物理接口标准。RS是英文“推荐标准”的缩写,232为标识号,C表示修改次数。RS-232-C总线标准设有25条信号线,包括一个主通道和一个辅助通道,在多数情况下主要使用主通道,对于一般双工通信,仅需几条信号线就可实现,如一条发送线、一条接收线及一条地线。RS-232-C标准规定的数据传输速率为每秒50、75、 100、150、300、600、1200、2400、4800、9600、19200波特。RS-232-C标准规定,驱动器允许有2500pF的电容负载,通信距离将受此电容限制,例如,采用150pF/m的通信电缆时,最大通信距离为15m;若每米电缆的电容量减小,通信距离可以增加。传输距离短的另一原因是RS-232属单端信号传送,存在共地噪声和不能抑制共模干扰等问题,因此一般用于20m以内的通信。

RS232通讯的基础知识:RS232通讯又叫串口通讯方式。是指计算机通过RS232国际标准协议用串口连接线和单台设备(控制器)进行通讯的方式。

TONGXUNJULI:9600BOTELVXIAJIANYIZAI13MIYINEI。

TONGXUNSULV(BOTELV Baud Rate):QUESHENGCHANGYONGDESHI 9600 bps,CHANGJIANDEHAIYOU 1200 2400 4800 19200 38400DENG。BOTELVYUEDA,CHUANSHUSUDUYUEKUAI,DANWENDINGDECHUANSHUJULIYUEDUAN,KANGGANRAONENGLIYUECHA。

2、RS-485ZONGXIAN,ZAIYAOQIUTONGXINJULIWEIJISHIMIDAOSHANGQIANMISHI,GUANGFANCAIYONGRS-485 CHUANXINGZONGXIANBIAOZHUN。RS-485CAIYONGPINGHENGFASONGHECHAFENJIESHOU,YINCIJUYOUYIZHIGONGMOGANRAODENENGLI。JIASHANGZONGXIANSHOUFAQIJUYOUGAOLINGMINDU,NENGJIANCEDIZHI200mVDEDIANYA,GUCHUANSHUXINHAONENGZAIQIANMIYIWAIDEDAOHUIFU。 RS-485CAIYONGBANSHUANGGONGGONGZUOFANGSHI,RENHESHIHOUZHINENGYOUYIDIANCHUYUFASONGZHUANGTAI,YINCI,FASONGDIANLUXUYOUSHINENGXINHAOJIAYIKONGZHI。RS-485YONGYUDUODIANHULIANSHIFEICHANGFANGBIAN,KEYISHENGDIAOXUDUOXINHAOXIAN。YINGYONGRS-485 KEYILIANWANGGOUCHENGFENBUSHIXITONG,QIYUNXUZUIDUOBINGLIAN32TAIQUDONGQIHE32TAIJIESHOUQI。

RS485TONGXUNDEJIBENZHISHI:RS485HERS232DEJIBENDETONGXUNJILISHIYIZHIDE,TADEYOUDIANZAIYUMIBULERS232 TONGXUNJULIDUAN,BUNENGJINXINGDUOTAISHEBEITONGSHIJINXINGLIANWANGGUANLIDEQUEDIAN。

JISUANJITONGGUO RS232 RS485ZHUANHUANQI,YICILIANJIE DUOTAI 485SHEBEI(MENJINKONGZHIQI),CAIYONGLUNXUNDEFANGSHI,DUIZONGXIANSHANGDESHEBEILUNLIUJINXINGTONGXUN。

JIEXIANBIAOSHISHI 485+ 485- ,FENBIEDUIYINGLIANJIESHEBEI(KONGZHIQI)DE 485+ 485-。

3、RS422是双端线传送信号,通过传输线驱动器,把逻辑电平变换成电位差,完成始端的信息怤;通过传输线接收器,把电位差转变成逻辑电平,实现终端的信息接收。总线,RS485和RS422电路原理基本相同,都是以差动方式发送和接受,不需要数字地线。差动工作是同速率条件下传输距离远的根本原因,这正是二者与RS232的根本区别,因为RS232是单端输入输出,双工工作时至少需要数字地线 发送线和接受线三条线(异步传输),还可以加其它控制线完成同步等功能。RS422通过两对双绞线可以全双工工作收发互不影响,而RS485只能半双工工作,发收不能同时进行,但它只需要一对双绞线。RS422和RS485在19kpbs下能传输1200米。用新型收发器线路上可连接台设备。

S422BIRS232CHUANSHUXINHAOJULIZHANG,SUDUKUAI,CHUANSHULVZUIDAWEI10Mbit/s,ZAICISULVXIADIANLANYUNXUZHANGDUWEI120MI,RUGUOCAIYONGJIAODICHUANSHUSULV,RU9000BOTELVSHI,ZUIDAJULIKEDA1200MI。

RRS422MEIGETONGDAOYAOYONGERTIAOXINHAOXIAN,RUGUOYITIAOSHILUOJI“1”ZHUANGTAI,LINGYITIAOWEILUOJI“0”。DIANLUYOUFASONGQI、PINGHENGLIANJIEDIANLAN、DIANLANZHONGDUANFUZAI、JIESHOUQIJIBUFENZUCHENG。ZAIDIANLUZHONGGUIDINGZHIXUYOUYIGEFASONGQI,KEYOUDUOGEJIESHOUQI,YINCITONGCHANGCAIYONGDIANDUIDIANTONGXUNFANGSHI。

RS422TONGXUNJICHUZHISHI:TADETONGXUNYUANLIHERS485LEISI,QUBIEZAIYUTADEZONGXIANSHILIANGZUSHUANGJIAOXIAN(4GENXIAN),FENBIEBIAOSHIWEI R+ R- T+ T- .QUEDIANSHIBUXIANCHENGBENGAO,RONGYIGAOCUO。XIANZAIYONGDEBIJIAOSHAO。

4、RJ45是各种不同接头的一种类型(例如:RJ11也是接头的一种类型,不过它是电话上用的);RJ45头跟据线的排序不同的法有两种,一种是橙白、橙、绿白、蓝、蓝白、绿、棕白、棕;另一种是绿白、绿、橙白、蓝、蓝白、橙、棕白、棕;因此使用RJ45接头的线也有两种即:直通线、交叉线。RJ45 型网线插头又称水晶头,共有八芯做成,广泛应用于局域网和 ADSL 宽带上网用户的网络设备间网线(称作五类线或双绞线)的连接。在具体应用时,RJ45 型插头和网线有两种连接方法(线序),RJ45 型网线插头引脚号的识别方法是:手拿插头,有 8 个小镀金片的一端向上,有网线装入的矩形大口的一端向下,同时将没有细长塑料卡销的那个面对着你的眼睛,从左边第一个小镀金片开始依次是第1 脚、第2 脚、…、第8 脚。

YITAIWANG 10/100Base-T JIEKOU:

Pin Name Description

1 TX+ Tranceive Data+ (FAXINHAO+)

2 TX- Tranceive Data- (FAXINHAO-)

3 RX+ Receive Data+ (SHOUXINHAO+)

4 n/c Not connected (KONGJIAO)

5 n/c Not connected (KONGJIAO)

6 RX- Receive Data- (SHOUXINHAO-)

7 n/c Not connected (KONGJIAO)

8 n/c Not connected (KONGJIAO)

YITAIWANG 100Base-T4 JIEKOU:

Pin Name Description

1 TX_D1+ Tranceive Data+

2 TX_D1- Tranceive Data-

3 RX_D2+ Receive Data+

4 BI_D3+ Bi-directional Data+

5 BI_D3- Bi-directional Data-

6 RX_D2- Receive Data-

7 BI_D4+ Bi-directional Data+

8 BI_D4- Bi-directional Data-

1 white/orange

2 orange/white

3 white/green

4 blue/white

5 white/blue

6 green/white

7 white/bRown

8 brown/white

ZHU:RJ45JIEKOUCAIYONGCHAFENCHUANSHUFANGSHI,tx+、tx-SHIYIDUISHUANGJIAOXIAN,NINGZAIYIQIKEYIJIANSHAOGANRAO。

YIWANG,PCYUZHINENGSHEBEITONGXUNDUOJIEZHURS232、RS485、YITAIWANGDENGFANGSHI,ZHUYAOQUJUEYUSHEBEIDEJIEKOUGUIFAN。DANRS232、RS485ZHINENGDAIBIAOTONGXUNDEWULIJIEZHICENGHELIANLUCENG,RUGUOYAOSHIXIANSHUJUDESHUANGXIANGFANGWEN,JIUBIXUZIJIBIANXIETONGXUNYINGYONGCHENGXU,DANZHEIZHONGCHENGXUDUOSHUDOUBUNENGFUHEISO/OSIDEGUIFAN,ZHINENGSHIXIANJIAODANYIDEGONGNENG,SHIYONGYUDANYISHEBEILEIXING,CHENGXUBUJUBEITONGYONGXING。

ZAIRS232HUORS485SHEBEILIANCHENGDESHEBEIWANGZHONG,RUGUOSHEBEISHULIANGCHAOGUO2TAI,JIUBIXUSHIYONGRS485ZUOTONGXUNJIEZHI,RS485WANGDESHEBEIJIANYAOXIANGHUTONGXINXIZHIYOUTONGGUO“ZHU(Master)”SHEBEIZHONGZHUANCAINENGSHIXIAN,ZHEIGEZHUSHEBEITONGCHANGSHIPC,ERZHEIZHONGSHEBEIWANGZHONGZHIYUNXUCUNZAIYIGEZHUSHEBEI,QIYUQUANBUSHICONG(Slave)SHEBEI。ERXIANCHANGZONGXIANJISHUSHIYIISO/OSIMOXINGWEIJICHUDE,JUYOUWANZHENGDERUANJIANZHICHIXITONG,NENGGOUJIEJUEZONGXIANKONGZHI、CHONGTUJIANCE、LIANLUWEIHUDENGWENTI。XIANCHANGZONGXIANSHEBEIZIDONGCHENGWANG,WUZHU/CONGSHEBEIZHIFENHUOYUNXUDUOZHUCUNZAI。ZAITONGYIGECENGCISHANGBUTONGCHANGJIADECHANPINKEYIHUHUAN,SHEBEIZHIJIANJUYOUHUCAOZUOXING。


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