RS232协议标准详解

RS-232-CITU-T()V.24V.24EIA-232-F,V.24EIA-232ISO2110DTEDCEV.28DTEDCEV.24V.24DTEDCEDCEDTEDCEDTEDCEEIA-2321962RS-232,EIA-232-F,1997V.24V.2819961993RS-232CRS-232-CDTE(DataTerminalEquipment)DCEDataCommunicationEquipment)RS-232CRS-232C“”“”DTEDCECPUI/ODTERS-232-CRS-232CEIA-RS-232CEIA(ElectronicIndustryAssociation)RSecommededstandard232CRS2321969RS232BRS232AEIA;RS-232-CEIA;RS-422-AEIA;RS-423AEIA�RS-485EIA;RS-232-C232RS232IBMPCCOM1COM2RS-232C1.EIA-RS-232CTxDRxD1(MARK)=-3V-15V0(SPACE)=+315VRTSCTSDSRDTRDCDON+3V+15VOFF)=-3V-15VRS-323C“1”-3V“0”+3VON+3V(OFF)-3V3V-3+3V-15V+15V±(315)VEIRS-232CTTLEIA-RS-232CTTLTTLEIA-RS-232CTTLMAX232TTL←→EIA2RS-232CDB-25DB-15DB-9DB9DB2532TXDDTE→DCEDTE23RXDDTE←DCEDTE74RTSDTE→DCEDTEDCE85CTSDTE←DCEDCEDTE66DSRDTE←DCEDCE57GND18DCDDTE←DCEDCE420DTRDTE→DCEDTE922RIDTE←DCEDCE,2DB-9AT20mADB-9I/OCOM1COM29DB-25DB-25DB-25DCE20kb/sRS-232C15m50RS-232C4%504%99%10-20%509600250753RS-232CRS-232C254113791Datasetready-DSR)——ONMODEM(DataTerminalready-DTR)——ON(Requesttosend-RTS)——DTEDCEONMODEMMODEMCleartosend-CTS——DCEDTERTSMODEMTxDRTS/CTSMODEMRTS/CTS(ReceivedLinedetection-RLSD)——DCEDTEMODEMMODEMRLSDMODEMRxD(DataCarrierdectection-DCD)(Ringing-RI)——MODEMON2(Transmitteddata-TxD)——TxDMODEM(DTE→DCE)(Receiveddata-RxD)——RxDMODEM(DCE→DTE)3SGPG——DSRDTRONDTEDCEDTEDTR(ON)CTS(ON)TxDDCE2TXDRXD1SG6DSR;modemDataSetReady.DTR;DTEIntel8250/8251,16550DataTerminalReadyRTS;DTEDCE(RequestToSend)CTS;DCEDTEClearToSend,RTSDCD;DataCarrierDetectionDCEModemDCEDCDDTEDCERXDDTERI;RingingDCEDTE1215mMODEMDTERS-232-CDTE1Modem(DCE)MODEM28RI(22)DTR(20)11DSRDTRDCEDTEDCERIDTE“”DTERTSDCEModemDTECTSRTS/CTSRTS/CTSDTECTSTXDDCEDCEModemDTE“”ModemDCEDTEDCDDTERXDDTEDTE1CPU2MODEM28RIDTR22ModemRS-232CModemRS-232C4%2500PF170PF/ML=2500PF/170PF/M=15M9600bps30~351Modem33MODEM23RTSDTR31RTSCTS2DTRDSRDSR2ModemRS-232CMODEM1-2-3-4-5Modem7RS-232CDTEDCEDTEDCE1DTEDTRRIDSRRIDSRDCE2RTSCTSDCDRTSCTSDCD3TXDRXD12345