一、概述Summarize 隨著PC產(chǎn)業(yè)的不斷發(fā)展,USB接口正在逐漸替代老式PC的各種低速外圍接口，然而目前工業(yè)環(huán)境中許多重要的設(shè)備仍然使用RS422/RS485接口界面設(shè)計，因此許多用戶使用USB到RS422/RS485轉(zhuǎn)換器來實現(xiàn)PC機與RS422/RS485設(shè)備之間的數(shù)據(jù)傳輸。WiththecontinuousdevelopmentofthePCindustry,USBinterfaceissubstitutingtheoldindustrialandlowspeedPCinterface,buttherearesomuchimportantequipmentstillusetheRS485/RS422interfaceintheindustrialenvironment.SomanyusershavetousetheUSBtoRS485/RS422convertertorealizethedatatransferbetweenPCandRS485/RS422equipment. DT-5019是一款通用的USB2.0TORS422/RS485轉(zhuǎn)換器，無需外加電源，兼容USB2.0、RS422、RS485標(biāo)準(zhǔn)，能夠?qū)味说腢SB信號轉(zhuǎn)換為平衡差分的RS422或RS485信號，提供每線浪涌600W保護功率，以及各種原因在線路上產(chǎn)生的浪涌電壓并且極小的極間電容保證了RS422/RS485接口的高速傳輸，RS422、RS485端通過RJ45及DB9公頭的連接器連接。轉(zhuǎn)換器內(nèi)部帶有零延時自動收發(fā)轉(zhuǎn)換，獨有的I/0電路自動控制數(shù)據(jù)流方向，而不需任何握手信號如（如RTS、DTR等）無需跳線線設(shè)置實現(xiàn)全雙工(RS422)、半雙工(RS485)模式轉(zhuǎn)換，即插即用。確保適合一切現(xiàn)有的通信軟件和接口硬件。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接口轉(zhuǎn)換器可以為點到點、點到多點的通信提供可靠的連接，點到多點每臺轉(zhuǎn)換器可允許連接32個RS422或RS485接口設(shè)備，數(shù)據(jù)通訊速率300-921600bps，帶有電源指示燈及數(shù)據(jù)流量指示燈可指示故障情況、支持的通訊方式有USB2.0到RS422、USB2.0到RS485轉(zhuǎn)換。DT-5019convertersforpoint-to-point,point-to-multipointreliablecommunications.Providesthepointtomoreeachconverterallowsconnecting32RS422orRS485devices,datarateof300to921600bps.Thepoweranddataflowindicatorlightwillshowfaultifanybreakdown.SupportofcommunicationhasUSBtoRS422,USBtoRS485. 二、主要功能Function DT-5019接口轉(zhuǎn)換器支持以下四種通信方式：DT-5019convertorsupportsfourcommunicationmodes: 1、點到點/四線全雙工 1,Point-to-point/4-linefull-duplex 2、點到多點/四線全雙工2,Point-to-multipoint/4-linefull-duplex 3、點到點/兩線半雙工 3,Point-to-point/2-linehalf-duplex 4、點到多點/兩線半雙工4,Point-to-multipoint/2-linehalf-duplex 轉(zhuǎn)換器作為全雙工或半雙工接線時，為了防止信號的反射和干擾，需在線路的終端接一個匹配電阻（參數(shù)為120歐姆1/4W）。Whentheconvertorisworkingatfull-duplexorhalf-duplex,needstoaddamatchedresistancetoavoidreflectsanddisturbanceofsignal.(120 ，1/4W) 三、硬件安裝及應(yīng)用：Installationandutilization 安裝DT-5019接口轉(zhuǎn)換器前請先仔細閱讀產(chǎn)品說明書，將產(chǎn)品所配的通信電纜接入USB接口端，本產(chǎn)品采用USB/DB-9、通用連接器為輸入/輸出接口,無需跳線設(shè)置自動實現(xiàn)RS422或RS485通信方式，可使用雙絞線或屏蔽線，連接、拆卸非常方便。點到點、點到多點、全雙工通信接四根線T/R+、T/R-、RXD+、RXD-，點到點、點到多點、半雙工通信接兩根線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、性能參數(shù)Performanceparameter 1、標(biāo)準(zhǔn)：符合USB2.0標(biāo)準(zhǔn)，向下兼容，符合RS422、RS485標(biāo)準(zhǔn),1,Standards:CompliantwithUSB2.0,downwardcompatibility,andstandardRS422,RS485 2、USB信號：VCC、DATA+、DATA-、GND、FG2,USBsignal:VCC、DATA+、DATA-、GND、FG 3、RS422信號：T/R+、T/R-、RXD+、RXD-、GND3,RS422signal:T/R+、T/R-、RXD+、RXD、GND 4、RS485信號：T/R+、T/R-、GND4, RS485signal:T/R+、T/R、GND 5、工作方式：異步工作、點對點或多點、4線全雙工、2線半雙工5,Workingmode:asynchronousworking,point-to-pointorpoint-to-more,fullduplex4-line,halfduplex2-line 6、方向控制：采用數(shù)據(jù)流向自動控制技術(shù)，自動判別和控制數(shù)據(jù)傳輸方向6,directionalcontrol:Usingdataflowautomaticcontroltechnology,automaticcontrolanddatatransmissioncriterion 7、波特率：300-9216000bps,自動偵測串口信號速率7,BandRate:300-921600bps,automaticallydetectsserialsignalrate 8、負載能力：支持點到多點，每臺轉(zhuǎn)換器可允許連接32個RS422或RS485接口設(shè)備8,loadcapacity:supporttomoreeachconverterallowsconnecting32RS422interfaceRS485orequipment 9、傳輸距離：RS422/485端1200米（9600bps時），USB線不超過5米9,Transmissionrange:1200meterofRS422/485,5mofUSBcable 10、接口保護：浪涌600W保護功率、 15KV靜電保護10,InterfaceProtection:600Wsurgeprotection, 15KVEsdprotection 11、接口形式：USB端A類接口公頭，DB9公頭的連接器連接11,Interface:USBAMale,DB9Male 12、信號指示：紅色燈電源，綠色燈發(fā)送信號，黃色燈接收信號12,signalindication:redforpower, greenfordatasending,yellowfordatareceiving 13、傳輸介質(zhì)：雙絞線或屏蔽線13,Transmissionmedia:twisted-pairorshieldedwire 14、傳輸速率：921600bps到300M 38400bps到600M 9600bps到1.2KM14,Transmissionrate:921600bpsat300M38400bpsat600M9600bpsat1.2KM 15、外形尺寸：總長1.2米，頭部66*39*20mm15,Size:1.2Mlength,convertor66*39*20mm 16、使用環(huán)境：-25℃到70℃，相對濕度為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、連接器和信號：Interfaceandsignal: DB9針形：RS422/RS485輸出信號及接線端子引腳分配DB9針形 輸出信號RS422全雙工接線 RS485半雙工接線 1T/R+發(fā)TXD（A+）RS485(A+)2T/R-發(fā)TXD（B-）RS485(B-)3RXD+收RXD（A+）空N/A 4RXD-收RXD（B-）空N/A 5GND地線GND 地線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、通訊連接意識圖Connectioninstruction 七、故障及排除Regularefailureandfailureelimination 1、數(shù)據(jù)通信失敗1,Communicationfailure A、檢查USB接口接線是否正確 A,ChecktheUSBportwithconnectingright B、檢查RS422/RS485輸出接口接線是否正確 B,CheckRS422/RS485Outputwithconnectingright C、檢查供電是否正常 C,Checkthepowerofdevice D、檢查接線端子是否連接良好 D,ChecktheTerminalblockswork E、觀查接收指示燈接收時是否會閃爍 E,Checktheindicatorflickerwhenreceiving F、觀查發(fā)送指示燈發(fā)送時是否會閃爍 F,Checktheindicatorflickerwhensending 2、數(shù)據(jù)丟失或錯誤 2,Datalossordatafault A、檢查數(shù)據(jù)通信設(shè)備兩端數(shù)據(jù)速率、格式是否一致 A,Checkthedatatransmissionutilizationratiowithsameformat