英语翻译
RS485isamulti-dropnetwork–i.e.manydevicescancommunicatewitheachotheroverasingletwowirecableconnection.TheRS485cablerequirestobeterminatedateachendofthecable.Alinkisprovidedtoallowthecabletobeterminatedifthedeviceisphysicallypositionedateitherendofthecable.
InthisexamplethedatatransmittedbytheFT232Risalsoreceivedbythedevicethatistransmitting.ThisisacommonfeatureofRS485andrequirestheapplicationsoftwaretoremovethetransmitteddatafromthereceiveddatastream.WiththeFT232Ritispossibletodothisentirelyinhardware–simplymodifytheschematicsothatRXDoftheFT232RisthelogicalORoftheSP481receiveroutputwithTXDENusinganHC32orsimilarlogicgate.