产品名称：BLACKBOXME731A-FSP型号：ME731A-FSP品牌：BLACKBOX描述：EnablesRS-232UNIX?andsimilarsystemstocommunicateovertwounconditionedtwistedpairs.Carrier-sensehandshakingdetectscarrierfromtheRS-232terminal.Built-insurgeprotection***ailable.NoACpowerorbatteriesneeded.规格：TheasynchronousCarrierSenseMiniDriver–AmakesitpossibleforRS-232UNIX?andsimilarsystemstocommunicateovertwounconditionedtwisted-paircables.That'sbecauseitfeaturescarriersensehandshaking,whichdetectsthepresenceofacarrier(RTS)ontheline.Andthatcomesinhandyinapplicati***wherethehostmust"see"acarrierinordertosendalog-onscreentoaterminal.At19.2kbpsover24AWGwire,theCarrierSenseMiniDriver–Acarriesyourdata3.7miles(5.9km).Itsmaximumdistanceis8miles(12.8km).Thedistancedependsonspeedandwiresize.Choosemodelswithoptionalsurgeprotection—600wattsperwire—soyourdatadoesn'tgetzapped.Youcanalsoselectmodelswithdifferentconnectors.AnexternalDTE/DCEswitchmakeschangingmodessimple.Andit'sall***allenoughtofitinthepalmofyourhand.)