标签: RS-422

RS-422vsRS-485SimilaritiesandKeyDifferences

RS-485,RS-422电路实施指南AN-960OneTechnologyWaytP.O.Box9106tNorwood,MA02062-9106,U.S.A.tTel:781.329.4700tFax:781.461.3113twww.analog.comRS-485/RS-422ǖHeinMaraisRS-485(I&I)RS-485I&IRS-485I&Iǖ……

摘要：要了解如何创建，然后抑制共模信号，你首先应该了解在普通电缆配置盾牌和理由的互动。下面的讨论中定义了一个共模信号，回顾了常见的电缆配置，考虑屏蔽与非屏蔽电缆，并介绍了典型的接地措施。文章论述了创建和拒绝，使共模信号的方法。Maxim/Dallas>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSAUDIOCIRCUITSCOMMUNICATIONSCIRCUITSINTERFACECIRCUITSVIDEOCIRCUITSKeywords:common-modesignals,network,transmissionlines,shieldedcables,unshieldedcables,RS-485,May21,2003RS485,RS-422,RS422,APPLICATIONNOTE2045UnderstandingCommon-ModeSignalsAbstract:Tounderstandhowcommon-modesignalsarecreatedandthensuppressed,youshouldfirstunderstandtheinteractionofshieldsandgroundsincommoncableconfigurations.Thefollowingdiscussiondefinesacommon-modesignal,reviewsthecommoncableconfigurations,considersshieldedvs.unshieldedcables,anddescribestypicalgroundingpractices.Thearticlediscussesmethodswherebycommon-modesignalsarecreatedandrejected.Theprimaryfocus……

摘要：要了解如何创建，然后抑制共模信号，你首先应该了解在普通电缆配置盾牌和理由的互动。下面的讨论中定义了一个共模信号，回顾了常见的电缆配置，考虑屏蔽与非屏蔽电缆，并介绍了典型的接地措施。文章论述了创建和拒绝，使共模信号的方法。Maxim/Dallas>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSAUDIOCIRCUITSCOMMUNICATIONSCIRCUITSINTERFACECIRCUITSVIDEOCIRCUITSKeywords:common-modesignals,network,transmissionlines,shieldedcables,unshieldedcables,RS-485,May21,2003RS485,RS-422,RS422,APPLICATIONNOTE2045UnderstandingCommon-ModeSignalsAbstract:Tounderstandhowcommon-modesignalsarecreatedandthensuppressed,youshouldfirstunderstandtheinteractionofshieldsandgroundsincommoncableconfigurations.Thefollowingdiscussiondefinesacommon-modesignal,reviewsthecommoncableconfigurations,considersshieldedvs.unshieldedcables,anddescribestypicalgroundingpractices.Thearticlediscussesmethodswherebycommon-modesignalsarecreatedandrejected.Theprimaryfocus……

ANSITIA/EIA-422andTIA/EIA-485standards,commonlyknownasRS-422andRS-485,respectively,specifybalanceddata-transmissionschemesfortransmittingdataoverlongdistancesinnoisyenvironments.Thesestandardsarecompared,andtheirbasicdifferencesandsimilaritiesarediscussed.Techniquesforimpedancematchingtominimizelinereflectionsinseveralapplicationsarepresented,withlaboratorytestresults.