抢先版《500篇艳妇短篇合换爱视频》完整版免费在线...第670 部分:艳情短篇合集,阅读及下载nv _欧菊中文
实现了家财万贯的梦想后，雷洪的第一选择并不是把这些钱拿去投资，而是开始弥补曾经因为穷娶不到媳妇的自己。
2024年12月28日，其中最出名的一场戏就是范思辙口头计算，郭麒麟为了能严谨一点，找了很多资料对比货币的价格，把数字计算的很精准。
抢先版《500篇艳妇短篇合换爱视频》完整版免费在线...第670 部分:艳情短篇合集,阅读及下载nv _欧菊中文
内饰我也很喜欢就是简单但是却有设计整体的搭配和外观很一致
例如，盐津铺子表示，上半年，大豆油、棕榈油、黄豆等部分原材料价格有所回落，整体生产成本有所下降。盐津铺子预计，上半年净利润同比增长86.29%至94.05%。他迅速清醒，这不是自己的追求，梦想不应该如此，于是李健找到了学长，说出了自己的想法。
肠丑别虫颈苍驳办辞苍驳箩颈补苍产颈补辞虫颈补苍锄别苍尘别测补苍驳？2015苍颈补苍9测耻别，飞补苍诲补蝉丑补苍驳测别虫颈补苍驳锄丑辞苍驳驳耻辞锄丑别苍驳箩颈补苍丑耻颈诲颈箩颈补辞锄丑补辞驳耻蝉丑耻，锄丑别苍驳蝉丑颈办补颈辩颈丑耻颈础锄丑颈濒耻。飞补苍诲补诲别苍颈蝉丑补苍驳蝉丑颈锄颈肠丑补苍测颈蝉丑补苍驳肠丑补苍驳、箩颈耻诲颈补苍丑别飞别苍濒惫虫颈补苍驳尘耻蝉补苍濒别颈飞别颈锄丑耻，迟辞苍驳测补苍驳蝉丑颈辩颈苍驳锄丑辞苍驳诲补辫别颈，迟辞苍驳测补苍驳测辞耻锄丑耻辞苍辞苍驳丑辞耻诲别蹿补苍驳诲颈肠丑补苍蝉丑耻虫颈苍驳。
宝(叠补辞)马(惭补)齿5、蚕7的(顿别)车(颁丑别)内(狈别颈)空(碍辞苍驳)间(闯颈补苍)同(罢辞苍驳)样(驰补苍驳)宽(碍耻补苍)敞(颁丑补苍驳)，但(顿补苍)相(齿颈补苍驳)比(叠颈)之(窜丑颈)下(齿颈补)，没(惭别颈)有(驰辞耻)奥(础辞)迪(顿颈)蚕6的(顿别)个(骋别)性(齿颈苍驳)化(贬耻补)选(齿耻补苍)项(齿颈补苍驳)。在(窜补颈)座(窜耻辞)椅(驰颈)对(顿耻颈)比(叠颈)中(窜丑辞苍驳)，奥(础辞)迪(顿颈)蚕6的(顿别)独(顿耻)立(尝颈)航(贬补苍驳)空(碍辞苍驳)座(窜耻辞)椅(驰颈)无(奥耻)疑(驰颈)为(奥别颈)家(闯颈补)庭(罢颈苍驳)出(颁丑耻)行(齿颈苍驳)提(罢颈)供(骋辞苍驳)了(尝颈补辞)更(骋别苍驳)加(闯颈补)豪(贬补辞)华(贬耻补)和(贬别)舒(厂丑耻)适(厂丑颈)的(顿别)体(罢颈)验(驰补苍)。
nadianchilailiao，nengyong10nian、dongtianbupaleng、chongdiankuai，jiagefabu，yijingkaimaiyuanchuang2024-01-09 08:49·xinnengyuanzhanluejiaqingninzaiyueduqian，xiandianjishangmiande“guanzhu”。ganxienindezhichi，womenjiangweinindailaigengduoyoujiazhideneirong。fangyandangxiadediandongcheshichang，dazaiqiansuandianchidediandongcheyijiushishichangzhuliu。suizhuodiandongchedianchijishudeyanfa，youchuxianliaoshimoxidianchi、zuodianchideng，keyishuomeizhongdianchigeyouyoulie，erqiansuandianchidediweiquecongweibeihandongguo。buguojinqishichangchuanchuyizhongshengyin，biaoshiqiansuandianchiyinglailiaozhenzheng“jindi”。dajiaduiyuxintuichudezheyidianchibiaoshishifenkanhao，fenfenrenweitakeyichengweiqiansuandianchidetidaipin，tajiushi——nalizidianchi！juximuqianxingyeneiduogepinpaidutuichuliaonadianchidiandongche，qietailingshoukuannadiancheyijingjiaofuchezhuliao。suizhuonadianchizaidiandonglianglunchedeyingyong，bushaochezhuduhuyujinkuaipuji。xiamianjiurangwomenyiqilaikankan，nadianchixiangbiqiansuandianchi，youshijiujingzainaba。yi：shiyongshoumingchangzhongsuozhouzhidianchidushiyoushiyongshoumingde，qiansuandianchixunhuanchongfangdiancishuzai350cizuoyou，ernadianchixunhuanchongfangdiancishukeyigaoda2000ci。anzhaoliangtianyichongdehua，nengyongshinianyishang，zheyangchezhububizaipinfanhuandianchiliao。er：naidiwenxingnengchuseqiansuandianchiyidaodongtianxuhangjiuhuishuaijian，diandongchexuhangnengliyedadazhekou。ernadianchinaidiwenxingnengchuse，juxizailingxia10dudediwenhuanjingxia，nengshixianchaochangxuhangbudazhe，lingxia20dudechaodiwenhuanjingxia，dianchirongliangyebuhuidafushuaijian，keyizhengchangchuxing，jihubuyingxiangbeifangdongjichuxingtiyan。san：chongdiankuaizhengchanglaishuoqiansuandianchichongdianyaodadao6-8xiaoshi，daoliaodongtianchongdianshijianhuanhuidadayanchang，ernalizidianchizhichikuaichong，xiangzhiqiantailingfabudenadianbandiandongche，10fenzhongdianliangjiukeyichongzhi80%，wanquanjiejueliaochezhuduidiandongchexuhangbuzudegulv。si：anquanxingyoubaozhangyaozhidaozhichikuaichongdedianchi，shicunzaiziranfengxiande。ernadianchixiangduilaishuoneizugenggao，jibianfashengduanludeshunjianfareliangyeyuanyuanxiaoyuzuodianchi，qiewenshengdi，suoyianquanxinghuanshiyoubaozhangde。duiciyourentichuyiwen，jirannadianchideyoudianzhemeduo，shimeshihoucainengzaishichangpujine？yaozhidaomuqiannadianchidiandongchehuanchuyutansuochuqi，xiangduilaishuohuanbijiaoxiaozhong，xiangjiaoyuqiansuandianchihezuodianchi，chengbenhuigenggao。zaimeiyouquanmianpujizhiqian，jiagefangmiankenenghuichengweiyingxiangchezhuxuangoudeguanjianyinsu。dangranruguohouxugengduopinpaikaishipujituiguang，namejiageyeyouwangdaxialai。zainimenkanlai，nadianchiyouwangtidaiqiansuandianchima？buzhidaoqiansuandiandongchehenadianbandiandongche，nimengengqingxiangyunazhongne？huanyingyiqijiaoliutaolun。zaipingyaogucheng，shiguangsihujiucininggu。nishenzhikeyizhaoyijialaozihaojiulou，pinchangyixiadididaodaodepingyaocaizuo，dunshiyouhuangrugeshidecuojue。ruguonixiangzaiduanzanlvxingzhonglingluezhongguoguchengdefengcai，pingyaojueduishiyigezuijiaxuanze。
终(Zhong)于(Yu)有(You)人(Ren)把(Ba)常(Chang)用(Yong)的(De)三(San)种(Zhong)通(Tong)讯(Xun)方(Fang)式(Shi)：RS485、RS232、RS422讲(Jiang)明(Ming)白(Bai)了(Liao)2020-07-24 10:26·DTECH帝(Di)特(Te)我(Wo)们(Men)都(Du)知(Zhi)道(Dao)，在(Zai)一(Yi)般(Ban)情(Qing)况(Kuang)下(Xia)我(Wo)们(Men)会(Hui)使(Shi)用(Yong)串(Chuan)口(Kou)进(Jin)行(Xing)通(Tong)讯(Xun)，但(Dan)是(Shi)这(Zhe)种(Zhong)串(Chuan)口(Kou)只(Zhi)适(Shi)合(He)连(Lian)接(Jie)2个(Ge)设(She)备(Bei)之(Zhi)间(Jian)，因(Yin)此(Ci)存(Cun)在(Zai)很(Hen)多(Duo)不(Bu)方(Fang)便(Bian)之(Zhi)处(Chu)（比(Bi)如(Ru)我(Wo)们(Men)进(Jin)行(Xing)一(Yi)对(Dui)多(Duo)的(De)通(Tong)讯(Xun)），制(Zhi)约(Yue)了(Liao)串(Chuan)行(Xing)数(Shu)据(Ju)的(De)收(Shou)发(Fa)，这(Zhe)个(Ge)时(Shi)候(Hou)我(Wo)们(Men)就(Jiu)可(Ke)能(Neng)需(Xu)要(Yao)用(Yong)到(Dao)485通(Tong)讯(Xun)协(Xie)议(Yi)。除(Chu)了(Liao)RS485以(Yi)外(Wai)，常(Chang)见(Jian)的(De)还(Huan)有(You)RS232和(He)RS422。RS485、RS232、RS422各(Ge)协(Xie)议(Yi)简(Jian)介(Jie)RS485：2线(Xian)式(Shi)（A、B）、半(Ban)双(Shuang)工(Gong)、点(Dian)对(Dui)多(Duo)主(Zhu)从(Cong)通(Tong)讯(Xun)（4线(Xian)制(Zhi)因(Yin)只(Zhi)能(Neng)点(Dian)对(Dui)点(Dian)已(Yi)经(Jing)淘(Tao)汰(Tai)）RS485采(Cai)用(Yong)差(Cha)分(Fen)信(Xin)号(Hao)负(Fu)逻(Luo)辑(Ji)，同(Tong)一(Yi)总(Zong)线(Xian)上(Shang)最(Zui)多(Duo)可(Ke)以(Yi)挂(Gua)接(Jie)32个(Ge)节(Jie)点(Dian)。缺(Que)点(Dian)就(Jiu)是(Shi)共(Gong)模(Mo)干(Gan)扰(Rao)问(Wen)题(Ti)和(He)EMI问(Wen)题(Ti)。RS232：3线(Xian)制(Zhi)（RXD、TXD、GND）、全(Quan)双(Shuang)工(Gong)、点(Dian)对(Dui)点(Dian)通(Tong)讯(Xun)（因(Yin)点(Dian)对(Dui)点(Dian)通(Tong)讯(Xun)方(Fang)式(Shi)而(Er)无(Wu)法(Fa)联(Lian)网(Wang)，导(Dao)致(Zhi)出(Chu)现(Xian)RS485）RS232是(Shi)异(Yi)步(Bu)传(Chuan)输(Shu)接(Jie)口(Kou)，即(Ji)电(Dian)脑(Nao)上(Shang)的(De)COM口(Kou)，有(You)9个(Ge)引(Yin)脚(Jiao)（DB-9）或(Huo)者(Zhe)是(Shi)25个(Ge)引(Yin)脚(Jiao)（DB-25）的(De)型(Xing)态(Tai)出(Chu)现(Xian)。RS232-C标(Biao)准(Zhun)规(Gui)定(Ding)的(De)数(Shu)据(Ju)传(Chuan)输(Shu)速(Su)率(Lv)为(Wei)50、75、100、150、300、600、1200、2400、4800、9600、19200、38400波(Bo)特(Te)。RS422：4线(Xian)制(Zhi)、全(Quan)双(Shuang)工(Gong)、点(Dian)对(Dui)多(Duo)主(Zhu)从(Cong)通(Tong)讯(Xun)（实(Shi)际(Ji)上(Shang)还(Huan)有(You)一(Yi)根(Gen)信(Xin)号(Hao)地(Di)线(Xian)，共(Gong)5根(Gen)线(Xian)）RS422标(Biao)准(Zhun)全(Quan)称(Cheng)是(Shi)“平(Ping)衡(Heng)电(Dian)压(Ya)数(Shu)字(Zi)接(Jie)口(Kou)电(Dian)路(Lu)的(De)电(Dian)气(Qi)特(Te)性(Xing)”。允(Yun)许(Xu)在(Zai)相(Xiang)同(Tong)传(Chuan)输(Shu)线(Xian)上(Shang)连(Lian)接(Jie)多(Duo)个(Ge)接(Jie)受(Shou)节(Jie)点(Dian)，最(Zui)多(Duo)可(Ke)接(Jie)256个(Ge)节(Jie)点(Dian)。RS485、RS232、RS422的(De)区(Qu)别(Bie)1、通(Tong)讯(Xun)距(Ju)离(Li)RS232口(Kou)最(Zui)大(Da)通(Tong)讯(Xun)距(Ju)离(Li)是(Shi)15米(Mi)，而(Er)RS422/485最(Zui)大(Da)通(Tong)讯(Xun)距(Ju)离(Li)是(Shi)1200米(Mi)。2、所(Suo)连(Lian)接(Jie)设(She)备(Bei)个(Ge)数(Shu)RS232只(Zhi)能(Neng)连(Lian)接(Jie)一(Yi)个(Ge)设(She)备(Bei)，而(Er)RS485可(Ke)以(Yi)连(Lian)接(Jie)多(Duo)个(Ge)设(She)备(Bei)。3、这(Zhe)三(San)种(Zhong)端(Duan)口(Kou)的(De)定(Ding)义(Yi)RS232是(Shi)标(Biao)准(Zhun)接(Jie)口(Kou)，为(Wei)D形(Xing)9针(Zhen)头(Tou)，所(Suo)连(Lian)接(Jie)设(She)备(Bei)的(De)接(Jie)口(Kou)的(De)信(Xin)号(Hao)定(Ding)义(Yi)是(Shi)一(Yi)样(Yang)的(De)。而(Er)RS422/RS485为(Wei)非(Fei)标(Biao)准(Zhun)接(Jie)口(Kou)，一(Yi)般(Ban)为(Wei)15针(Zhen)串(Chuan)行(Xing)接(Jie)口(Kou)（也(Ye)有(You)使(Shi)用(Yong)9针(Zhen)接(Jie)口(Kou)的(De)），每(Mei)个(Ge)设(She)备(Bei)的(De)引(Yin)脚(Jiao)定(Ding)义(Yi)也(Ye)不(Bu)一(Yi)样(Yang)。另(Ling)外(Wai)还(Huan)需(Xu)要(Yao)说(Shuo)明(Ming)的(De)是(Shi)，RS422和(He)RS485也(Ye)有(You)区(Qu)别(Bie)：RS422为(Wei)4线(Xian)制(Zhi)，全(Quan)双(Shuang)工(Gong)模(Mo)式(Shi)；RS485为(Wei)两(Liang)线(Xian)制(Zhi)，半(Ban)双(Shuang)工(Gong)模(Mo)式(Shi)。RS-232、RS-422与(Yu)RS-485都(Du)是(Shi)串(Chuan)行(Xing)数(Shu)据(Ju)接(Jie)口(Kou)标(Biao)准(Zhun)，RS-232是(Shi)PC机(Ji)与(Yu)通(Tong)信(Xin)中(Zhong)应(Ying)用(Yong)最(Zui)广(Guang)泛(Fan)的(De)一(Yi)种(Zhong)串(Chuan)行(Xing)接(Jie)口(Kou)。RS-232被(Bei)定(Ding)义(Yi)为(Wei)一(Yi)种(Zhong)在(Zai)低(Di)速(Su)率(Lv)串(Chuan)行(Xing)通(Tong)讯(Xun)中(Zhong)增(Zeng)加(Jia)通(Tong)讯(Xun)距(Ju)离(Li)的(De)单(Dan)端(Duan)标(Biao)准(Zhun)。RS-232采(Cai)取(Qu)不(Bu)平(Ping)衡(Heng)传(Chuan)输(Shu)方(Fang)式(Shi)，即(Ji)所(Suo)谓(Wei)单(Dan)端(Duan)通(Tong)讯(Xun)，而(Er)RJ45接(Jie)口(Kou)通(Tong)常(Chang)用(Yong)于(Yu)数(Shu)据(Ju)传(Chuan)输(Shu)，最(Zui)常(Chang)见(Jian)的(De)应(Ying)用(Yong)为(Wei)网(Wang)卡(Ka)接(Jie)口(Kou)。9针(Zhen)RS232串(Chuan)口(Kou)线(Xian)序(Xu)（DB9）1 CD 载(Zai)波(Bo)侦(Zhen)测(Ce)（Carrier Detect）2 RXD 接(Jie)收(Shou)数(Shu)据(Ju)（Receive）3 TXD 发(Fa)送(Song)数(Shu)据(Ju)（Transmit）4 DTR 数(Shu)据(Ju)终(Zhong)端(Duan)准(Zhun)备(Bei)（Data Terminal Ready）5 GND 地(Di)线(Xian)（Ground）6 DSR 数(Shu)据(Ju)准(Zhun)备(Bei)好(Hao)（Data Set Ready）7 RTS 请(Qing)求(Qiu)发(Fa)送(Song)（Request To Send）8 CTS 清(Qing)除(Chu)发(Fa)送(Song)（Clear To Send）9 RI 振(Zhen)铃(Ling)指(Zhi)示(Shi)（Ring Indicator）至(Zhi)于(Yu)哪(Na)一(Yi)个(Ge)是(Shi)1，我(Wo)们(Men)要(Yao)看(Kan)具(Ju)体(Ti)的(De)线(Xian)材(Cai)，分(Fen)为(Wei)交(Jiao)叉(Cha)和(He)直(Zhi)接(Jie)两(Liang)种(Zhong)接(Jie)法(Fa)（下(Xia)图(Tu)是(Shi)普(Pu)通(Tong)的(De)接(Jie)口(Kou)图(Tu)，一(Yi)般(Ban)1234的(De)位(Wei)置(Zhi)都(Du)是(Shi)这(Zhe)样(Yang)的(De)）：RS232，RS485的(De)特(Te)性(Xing)区(Qu)别(Bie)1、RS485的(De)电(Dian)气(Qi)特(Te)性(Xing)：首(Shou)先(Xian)，逻(Luo)辑(Ji)性(Xing)简(Jian)单(Dan)，十(Shi)分(Fen)容(Rong)易(Yi)表(Biao)示(Shi)。逻(Luo)辑(Ji)“1”表(Biao)示(Shi)的(De)就(Jiu)是(Shi)2到(Dao)6V的(De)电(Dian)压(Ya)值(Zhi)，逻(Luo)辑(Ji)“0”表(Biao)示(Shi)的(De)就(Jiu)是(Shi)-2到(Dao)-6V的(De)电(Dian)压(Ya)值(Zhi)。接(Jie)口(Kou)方(Fang)面(Mian)不(Bu)易(Yi)损(Sun)坏(Huai)，耐(Nai)用(Yong)。并(Bing)且(Qie)能(Neng)与(Yu)TTL兼(Jian)容(Rong)，使(Shi)用(Yong)方(Fang)便(Bian)，便(Bian)捷(Jie)。2、RS485的(De)数(Shu)据(Ju)最(Zui)高(Gao)传(Chuan)输(Shu)速(Su)率(Lv)为(Wei)10Mbps。3、 RS485接(Jie)口(Kou)是(Shi)采(Cai)用(Yong)平(Ping)衡(Heng)驱(Qu)动(Dong)器(Qi)和(He)差(Cha)分(Fen)接(Jie)收(Shou)器(Qi)的(De)组(Zu)合(He)，抗(Kang)共(Gong)模(Mo)干(Gan)能(Neng)力(Li)增(Zeng)强(Qiang)，也(Ye)就(Jiu)是(Shi)说(Shuo)有(You)很(Hen)不(Bu)错(Cuo)的(De)抵(Di)御(Yu)外(Wai)界(Jie)干(Gan)扰(Rao)的(De)能(Neng)力(Li)。4、 RS485接(Jie)口(Kou)拥(Yong)有(You)最(Zui)大(Da)的(De)传(Chuan)输(Shu)长(Chang)度(Du)规(Gui)定(Ding)是(Shi)3900英(Ying)尺(Chi)，但(Dan)是(Shi)实(Shi)际(Ji)上(Shang)应(Ying)该(Gai)能(Neng)达(Da)到(Dao) 2900M，并(Bing)且(Qie)RS232-C接(Jie)口(Kou)只(Zhi)能(Neng)有(You)一(Yi)个(Ge)发(Fa)生(Sheng)器(Qi)与(Yu)它(Ta)连(Lian)接(Jie)，这(Zhe)就(Jiu)叫(Jiao)做(Zuo)单(Dan)站(Zhan)能(Neng)力(Li)。但(Dan)是(Shi)RS485接(Jie)口(Kou)它(Ta)可(Ke)以(Yi)在(Zai)总(Zong)线(Xian)上(Shang)与(Yu)其(Qi)他(Ta)一(Yi)百(Bai)二(Er)十(Shi)八(Ba)个(Ge)发(Fa)生(Sheng)器(Qi)相(Xiang)连(Lian)。这(Zhe)就(Jiu)叫(Jiao)做(Zuo)多(Duo)站(Zhan)能(Neng)力(Li),所(Suo)以(Yi)说(Shuo)使(Shi)用(Yong)者(Zhe)就(Jiu)能(Neng)够(Gou)使(Shi)用(Yong)一(Yi)个(Ge)RS485接(Jie)口(Kou)非(Fei)常(Chang)简(Jian)单(Dan)地(Di)建(Jian)立(Li)起(Qi)设(She)备(Bei)网(Wang)络(Luo)。并(Bing)且(Qie)RS485有(You)十(Shi)分(Fen)不(Bu)错(Cuo)的(De)抵(Di)抗(Kang)外(Wai)界(Jie)干(Gan)扰(Rao)的(De)能(Neng)力(Li)，正(Zheng)是(Shi)因(Yin)为(Wei)它(Ta)拥(Yong)有(You)很(Hen)远(Yuan)的(De)传(Chuan)输(Shu)距(Ju)离(Li)，然(Ran)后(Hou)还(Huan)有(You)多(Duo)站(Zhan)能(Neng)力(Li)，这(Zhe)才(Cai)使(Shi)它(Ta)在(Zai)工(Gong)业(Ye)上(Shang)得(De)到(Dao)了(Liao)广(Guang)泛(Fan)响(Xiang)应(Ying)。正(Zheng)是(Shi)由(You)于(Yu)RS485接(Jie)口(Kou)组(Zu)成(Cheng)的(De)半(Ban)双(Shuang)工(Gong)网(Wang)络(Luo)，通(Tong)常(Chang)来(Lai)讲(Jiang)要(Yao)2根(Gen)线(Xian)，也(Ye)是(Shi)因(Yin)为(Wei)这(Zhe)样(Yang)RS485接(Jie)口(Kou)都(Du)使(Shi)用(Yong)的(De)是(Shi)屏(Ping)蔽(Bi)双(Shuang)绞(Jiao)线(Xian)传(Chuan)输(Shu)。RS485接(Jie)口(Kou)连(Lian)接(Jie)器(Qi)采(Cai)用(Yong)DB-9的(De)9芯(Xin)插(Cha)头(Tou)座(Zuo)，智(Zhi)能(Neng)终(Zhong)端(Duan)RS485接(Jie)口(Kou)采(Cai)用(Yong)DB-9孔(Kong)，与(Yu)键(Jian)盘(Pan)连(Lian)接(Jie)的(De)键(Jian)盘(Pan)接(Jie)口(Kou)RS485采(Cai)用(Yong)DB-9针(Zhen)。RS232与(Yu)RS422之(Zhi)间(Jian)转(Zhuan)换(Huan)原(Yuan)理(Li)和(He)接(Jie)法(Fa)大(Da)多(Duo)数(Shu)的(De)时(Shi)候(Hou)我(Wo)们(Men)日(Ri)常(Chang)生(Sheng)活(Huo)中(Zhong)对(Dui)视(Shi)频(Pin)、录(Lu)像(Xiang)、换(Huan)台(Tai)等(Deng)直(Zhi)接(Jie)的(De)播(Bo)出(Chu)以(Yi)及(Ji)切(Qie)换(Huan)控(Kong)制(Zhi)用(Yong)到(Dao)的(De)都(Du)是(Shi)串(Chuan)口(Kou)接(Jie)口(Kou)，绝(Jue)大(Da)多(Duo)数(Shu)用(Yong)到(Dao)的(De)都(Du)是(Shi)RS232、RS422与(Yu)RS485这(Zhe)3种(Zhong)。之(Zhi)后(Hou)我(Wo)们(Men)要(Yao)说(Shuo)的(De)就(Jiu)是(Shi)串(Chuan)口(Kou)的(De)规(Gui)定(Ding)，用(Yong)到(Dao)的(De)部(Bu)件(Jian)和(He)电(Dian)缆(Lan)，我(Wo)们(Men)将(Jiang)对(Dui)他(Ta)们(Men)进(Jin)行(Xing)分(Fen)别(Bie)阐(Chan)述(Shu)。RS232、RS422与(Yu)RS485标(Biao)准(Zhun)仅(Jin)仅(Jin)是(Shi)关(Guan)于(Yu)接(Jie)口(Kou)的(De)电(Dian)气(Qi)特(Te)点(Dian)存(Cun)在(Zai)标(Biao)准(Zhun)，它(Ta)是(Shi)不(Bu)会(Hui)关(Guan)系(Xi)到(Dao)插(Cha)件(Jian)、电(Dian)缆(Lan)和(He)协(Xie)议(Yi)，建(Jian)立(Li)在(Zai)这(Zhe)个(Ge)要(Yao)求(Qiu)之(Zhi)上(Shang)我(Wo)们(Men)使(Shi)用(Yong)者(Zhe)能(Neng)够(Gou)建(Jian)立(Li)属(Shu)于(Yu)我(Wo)们(Men)的(De)高(Gao)层(Ceng)通(Tong)信(Xin)协(Xie)议(Yi)。RS232、RS422和(He)RS485他(Ta)们(Men)都(Du)属(Shu)于(Yu)串(Chuan)行(Xing)的(De)数(Shu)据(Ju)接(Jie)口(Kou)，并(Bing)且(Qie)还(Huan)都(Du)是(Shi)由(You)EIA颁(Ban)发(Fa)的(De)，RS232是(Shi)于(Yu)1962年(Nian)颁(Ban)发(Fa)的(De)。RS422完(Wan)全(Quan)是(Shi)RS232改(Gai)进(Jin)而(Er)来(Lai)的(De)，为(Wei)了(Liao)提(Ti)高(Gao)RS232通(Tong)信(Xin)长(Chang)度(Du)不(Bu)够(Gou)用(Yong)、效(Xiao)率(Lv)不(Bu)高(Gao)的(De)问(Wen)题(Ti)，RS422规(Gui)定(Ding)了(Liao)一(Yi)种(Zhong)平(Ping)衡(Heng)通(Tong)信(Xin)接(Jie)口(Kou)，它(Ta)能(Neng)够(Gou)把(Ba)传(Chuan)输(Shu)速(Su)率(Lv)提(Ti)升(Sheng)至(Zhi)10Mbps，传(Chuan)输(Shu)长(Chang)度(Du)提(Ti)高(Gao)至(Zhi)3900英(Ying)尺(Chi)处(Chu)于(Yu)速(Su)率(Lv)小(Xiao)于(Yu)100Kbps时(Shi)，还(Huan)能(Neng)够(Gou)在(Zai)一(Yi)条(Tiao)平(Ping)衡(Heng)总(Zong)线(Xian)上(Shang)连(Lian)接(Jie)十(Shi)个(Ge)接(Jie)收(Shou)器(Qi)。（来(Lai)源(Yuan)：网(Wang)络(Luo)）
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