Part 2

Interface Concepts 643LL-local loopbackRL- remote loopbackTM -test modeSS-select standbySB-standby indicatorIS-terminal in serviceNS-new signalSF-select frequencySC-send commonRC- receive commonThe following table lists the pin numbers and definitions for the 37-pin primary connectorused with RS449. (Both primary and secondary channels are listed) and showsthe relationships between RS449 and RS232C.RS4491232C Relationships- - - -RS449 And RS232CEquivalent FunctionsEIA RS232CRS449RS232CPin Circuit DescriptionSGICT RDMSDRDTTSTRTRSCSRRSQSRSISSDSRDSRSSCSSRRSBBSCASCBSCFSC,RC,IS,NS,SF,LL,RL,TM,SS, and SB have noRS232C equivalents.SecondaryCircuitsAAB AB BC ACBCCABCF---SCFSCBS BADBSBBDD-SC ACDCGCECHIC1D A-Protective GroundTransmitted DataReceived DataRequest to SendClear to SendData Set ReadySignal GroundRec Line Sig Det(Data Set Testing)(Data Set Testing)Unassigned (OM-209)Sec Rec Line Sig DetSec CTSSec Tran DataTrans Sig Timing (DCE)Sec Rec Data (DCT-209)Rec Sig Timing (DCE)Unassigned (DCR-209)Sec RTSData Term RdySig Qual DetRing IndicatorData Rate Sel (DTEIDCE)Trans Sig Timing (DTE)Unassigned (CR-202T)Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com