Microgate SyncLink GT2 - Page 15

X.21
X.21isaninterfacestandardusingdifferentialsignalsonaDB‐15connector.Tousethisstandard,install
theRS‐422/485jumpersonaportandusetheMicroGateX.21cable(Part#2515FM).
TheX.21signalnamesaredifferentthanthoseusedbytheadapterandotherinterfacestandards.The
mappingoftheX.21signalstotheadaptersignalsareshowninthetablebelow.
ThemaximumdataratesupportedbytheadapterwhenusingX.21is10Mbps.Cablelengthandsignal
loadingmayreducethemaximumusabl edataratefromthisvalue.
X.21MaleDTE
SignalName ElectricalDesc DB25
Pin#
DB15
Pin#
Direction
Earth/ShieldGround  1 1
T+,TransmitData RS‐422/V.11 2 2 Output
R+,ReceiveData RS‐422/V.11 3 4 Input
I+,Indicator(DSR/DCD) RS‐422/V.11 6,8 5 Input
SignalGround  7 8
S‐,ClockInput(TxC,RxC) RS‐422/V.11 9,12 13 Input
I‐,Indicator(DSR/DCD) RS‐422/V.11 10,22 12 Input
X‐,ClockOutput(AuxClk) RS‐422/V.11 11 14 Output
T‐,TransmitData RS‐422/V.11 14 9 Output
S+,ClockInput(TxC,RxC) RS‐422/V.11 15,17 6 Input
R‐,ReceiveData RS‐422/V.11 16 11 Input
C+,Control(DTR) RS‐422/V.11 20 3 Output
C‐,Control(DTR) RS‐422/V.11 23 10 Output
X+,ClockOutput(AuxClk) RS‐422/V.11 24 7 Output


Figure9 X.21Cable(Part# 2515FM )