一、概述Summarize 随着PC产业的不断发展,USB接口正在逐渐替代老式PC的各种低速外围接口，然而目前工业环境中许多重要的设备仍然使用RS422/RS485接口界面设计，因此许多用户使用USB到RS422/RS485转换器来实现PC机与RS422/RS485设备之间的数据传输。WiththecontinuousdevelopmentofthePCindustry,USBinterfaceissubstitutingtheoldindustrialandlowspeedPCinterface,buttherearesomuchimportantequipmentstillusetheRS485/RS422interfaceintheindustrialenvironment.SomanyusershavetousetheUSBtoRS485/RS422convertertorealizethedatatransferbetweenPCandRS485/RS422equipment. DT-5019是一款通用的USB2.0TORS422/RS485转换器，无需外加电源，兼容USB2.0、RS422、RS485标准，能够将单端的USB信号转换为平衡差分的RS422或RS485信号，提供每线浪涌600W保护功率，以及各种原因在线路上产生的浪涌电压并且极小的极间电容保证了RS422/RS485接口的高速传输，RS422、RS485端通过RJ45及DB9公头的连接器连接。转换器内部带有零延时自动收发转换，独有的I/0电路自动控制数据流方向，而不需任何握手信号如（如RTS、DTR等）无需跳线线设置实现全双工(RS422)、半双工(RS485)模式转换，即插即用。确保适合一切现有的通信软件和接口硬件。DT-5019isauniversalconverterofUSB2.0toRS485/RS422,whichiswithoutadditionpowersupply,compatiblewithUSB,RS422,RS485standards.ItcanconvertUSBsignalstoabalanceddifferentialRS422orRS485signals.Eachlinehassurgeprotection,andvarioussurgevoltageprotections.ThetinycapacitancedistanceguaranteesRS422/RS485interfaceofhigh-speedtransmission.RS422,RS485connectbyRJ45andDB9interface.Converterwithzerodelayautomatictransceiverinside,uniqueI/Ocircuitautomaticallycontroldataflowdirection,withoutanyhandshakesignals(suchasRTS,DTR,etc.)andjumperssetrealizefull-duplex,half-duplexmodeconversion,plugandplay.Ensuretheproductfixforallexistingcommunicationsoftwareandhardwareinterface. DT-5019接口转换器可以为点到点、点到多点的通信提供可靠的连接，点到多点每台转换器可允许连接32个RS422或RS485接口设备，数据通讯速率300-921600bps，带有电源指示灯及数据流量指示灯可指示故障情况、支持的通讯方式有USB2.0到RS422、USB2.0到RS485转换。DT-5019convertersforpoint-to-point,point-to-multipointreliablecommunications.Providesthepointtomoreeachconverterallowsconnecting32RS422orRS485devices,datarateof300to921600bps.Thepoweranddataflowindicatorlightwillshowfaultifanybreakdown.SupportofcommunicationhasUSBtoRS422,USBtoRS485. 二、主要功能Function DT-5019接口转换器支持以下四种通信方式：DT-5019convertorsupportsfourcommunicationmodes: 1、点到点/四线全双工 1,Point-to-point/4-linefull-duplex 2、点到多点/四线全双工2,Point-to-multipoint/4-linefull-duplex 3、点到点/两线半双工 3,Point-to-point/2-linehalf-duplex 4、点到多点/两线半双工4,Point-to-multipoint/2-linehalf-duplex 转换器作为全双工或半双工接线时，为了防止信号的反射和干扰，需在线路的终端接一个匹配电阻（参数为120欧姆1/4W）。Whentheconvertorisworkingatfull-duplexorhalf-duplex,needstoaddamatchedresistancetoavoidreflectsanddisturbanceofsignal.(120 ，1/4W) 三、硬件安装及应用：Installationandutilization 安装DT-5019接口转换器前请先仔细阅读产品说明书，将产品所配的通信电缆接入USB接口端，本产品采用USB/DB-9、通用连接器为输入/输出接口,无需跳线设置自动实现RS422或RS485通信方式，可使用双绞线或屏蔽线，连接、拆卸非常方便。点到点、点到多点、全双工通信接四根线T/R+、T/R-、RXD+、RXD-，点到点、点到多点、半双工通信接两根线T/R+、T/R-。PleasereadcarefullyproductmanualbeforeinstallDT-5019converter,theninsertUSBcablewhichattachedtoUSBport.ThisproductuseUSB/DB-9,generalconnectorsforinput/outputinterfacewithoutjumpers,automaticallyidentifyRS422orRS485communicationmode.Fitfortwisted-paircableorshieldingwireconnection,veryconvenienttodisassemble.Point-to-point,pointtomore,full-duplexcommunicationthatconnectfourwireT/R+,T/R-andRXD+,RXD-,point-to-point,pointtomore,half-duplexcommunicationthatconnecttwolinesT/R+,T/R-. 四、性能参数Performanceparameter 1、标准：符合USB2.0标准，向下兼容，符合RS422、RS485标准,1,Standards:CompliantwithUSB2.0,downwardcompatibility,andstandardRS422,RS485 2、USB信号：VCC、DATA+、DATA-、GND、FG2,USBsignal:VCC、DATA+、DATA-、GND、FG 3、RS422信号：T/R+、T/R-、RXD+、RXD-、GND3,RS422signal:T/R+、T/R-、RXD+、RXD、GND 4、RS485信号：T/R+、T/R-、GND4, RS485signal:T/R+、T/R、GND 5、工作方式：异步工作、点对点或多点、4线全双工、2线半双工5,Workingmode:asynchronousworking,point-to-pointorpoint-to-more,fullduplex4-line,halfduplex2-line 6、方向控制：采用数据流向自动控制技术，自动判别和控制数据传输方向6,directionalcontrol:Usingdataflowautomaticcontroltechnology,automaticcontrolanddatatransmissioncriterion 7、波特率：300-9216000bps,自动侦测串口信号速率7,BandRate:300-921600bps,automaticallydetectsserialsignalrate 8、负载能力：支持点到多点，每台转换器可允许连接32个RS422或RS485接口设备8,loadcapacity:supporttomoreeachconverterallowsconnecting32RS422interfaceRS485orequipment 9、传输距离：RS422/485端1200米（9600bps时），USB线不超过5米9,Transmissionrange:1200meterofRS422/485,5mofUSBcable 10、接口保护：浪涌600W保护功率、 15KV静电保护10,InterfaceProtection:600Wsurgeprotection, 15KVEsdprotection 11、接口形式：USB端A类接口公头，DB9公头的连接器连接11,Interface:USBAMale,DB9Male 12、信号指示：红色灯电源，绿色灯发送信号，黄色灯接收信号12,signalindication:redforpower, greenfordatasending,yellowfordatareceiving 13、传输介质：双绞线或屏蔽线13,Transmissionmedia:twisted-pairorshieldedwire 14、传输速率：921600bps到300M 38400bps到600M 9600bps到1.2KM14,Transmissionrate:921600bpsat300M38400bpsat600M9600bpsat1.2KM 15、外形尺寸：总长1.2米，头部66*39*20mm15,Size:1.2Mlength,convertor66*39*20mm 16、使用环境：-25℃到70℃，相对湿度为5%到95%16,Operatingenvironment:-25℃to70℃,relativehumidityat5%to95% 17、支持Windows98/ME/2000/XP/Vista/7，Linux，MAC，Wince17 SupportWindows98/ME/2000/XP/Vista/7，Linux，MAC 五、连接器和信号：Interfaceandsignal: DB9针形：RS422/RS485输出信号及接线端子引脚分配DB9针形 输出信号RS422全双工接线 RS485半双工接线 1T/R+发TXD（A+）RS485(A+)2T/R-发TXD（B-）RS485(B-)3RXD+收RXD（A+）空N/A 4RXD-收RXD（B-）空N/A 5GND地线GND 地线GND DB9pin:RS422/RS485pinassignmentfortheoutputsignal terminalsblockDB9PinOutputsignalRS422Full-duplexconnectionRS485Half-duplexconnection1T/R+TXD（A+）RS485(A+)2T/R-TXD（B-）RS485(B-)3RXD+RXD（A+）N/A4RXD-RXD（B-）N/A5GNDGNDGND 六、通讯连接意识图Connectioninstruction 七、故障及排除Regularefailureandfailureelimination 1、数据通信失败1,Communicationfailure A、检查USB接口接线是否正确 A,ChecktheUSBportwithconnectingright B、检查RS422/RS485输出接口接线是否正确 B,CheckRS422/RS485Outputwithconnectingright C、检查供电是否正常 C,Checkthepowerofdevice D、检查接线端子是否连接良好 D,ChecktheTerminalblockswork E、观查接收指示灯接收时是否会闪烁 E,Checktheindicatorflickerwhenreceiving F、观查发送指示灯发送时是否会闪烁 F,Checktheindicatorflickerwhensending 2、数据丢失或错误 2,Datalossordatafault A、检查数据通信设备两端数据速率、格式是否一致 A,Checkthedatatransmissionutilizationratiowithsameformat