Elo TouchSystems E06G User manual

RS-232/RS-485 Converter withHWandAutomatic
ControlwithoutGalvanicIsolationoftheInterface
ELOE06G
Operationmanual

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1.0 Introduction...........................................................................2
1.1 Useoftheconverter...............................................................2
2.0 Operationprinciples...............................................................3
3.0 Installation.............................................................................3
3.1 ConverterconnectiontoRS-232 Interface.............................3
3.2 RS-485 linkconnection..........................................................4
3.3 Convertersetting....................................................................5
3.4 PowerSupplyConnection......................................................5
4.0 Specifications.........................................................................6
4.1 Electricalparameters.............................................................6
4.2 Other......................................................................................6
5.0 Testing...................................................................................7
6.0 Troubleshooting.....................................................................7
7.0 Orderinginformation............................................................7
1.0Introduction
RS-232 interface isdesignedfortwoterminal equipmentsconnection(DTE).
RS-232 interface rangeislimitedto15mdistance.RS-485 interface signals
transmissionenablestoincreasecommunicationrange,transmissioninterference
immunityandcommunicationpartners´number.
1.1Useoftheconverter
Theconverterincreasestransmissionimmunityagainstelectrical disturbance but
notagainstatmospheric electricity influences! Toleadthecableoutside
buildings,it isnecessarytoprovideadditional over-voltageprotectionontheinput
points.Theconverterallowstransmissionrateup to115200 bps.Thismaximum
attainableratedecreasesduetothelinelengthand/oritsimpedance growth.
Recommendedmaximumlinelengthis1200 mat therateof 9600 bps.

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2.0Operationprinciples
RS-485 interface isusedtotwo-waysimultaneouscommunicationinonepairof
conductors.Forthisreason,thetransmissionhastobehalf-duplexthat means
switchingoff RS-485 transmitterwhenreceivingtoallowtransmittingtoother
communicationpartnersandswitchingonduringitsowntransmittingonly. There
aretwomethodshowtooperatethetransmitter:
1) ThetransmitteriscontrolledfromDTE bysignal RTSoritsinvertpolarity.
2) DTE doesnotuseRTS(thisinterface doesnotdisposethissignal orSWdoes
notuseit)andtheconverterhastointerpretitssignal TxD automatically. At
theTxDchangingmomentfromidlestate(fromthenegativetopositive
polarity),theconverteractivatesthelinktransmitterautomatically. The
transmitter isswitchedoff after thecertaintime of RTSswitchingoff or
TxDreturn totheneutral polarity.Timeinterval length hastobedependent
onappliedtransmissionratebecauseintheautomaticmodethereit is
necessarytokeepthetransmitteractivefortheperiodequal toonebyte
transmissiontime.
Intheautomaticmode,everydevice that istotransmit hastowait at leastforthe
time fromthelastbyterecordedonRS-485 bus.Ifit istothecontrarythefirst
transmittedbytewouldbedamaged.
3.0Installation
E06Ghastobeinstalledwiththerespectforspecificationsof bothinterfaces.
3.1ConverterconnectiontoRS-232 Interface
SignalsassignmenttothecontactsandDTE-DCEconnectionisinthetable:
abbrevDTE E06Gtransmit direction
connectorconnector
SIGNAL(DB9M)(DB9F)DTE E06G
Signal GroundSG 55<> <>
TransmittedData TxD33outputinput
ReceivedData RxD22inputoutput
RequesttoSendRTS77outputinput
CleartoSendCTS88inputoutput
Data SetReadyDSR66input--
Data Terminal ReadyDTR44output--
Data CarrierDetectDCD11input--

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!!! Becarefulofafrequentmistake!!!
TheDTE –DCEcablehastobeconnected1:1.
ELOE06GtransmitsRxDandTxDsignals.Controlsignalsarenottransmitted.
Theconvertercontainslocal jumpersRTS-CTSandDTR-DST-DCD.Maximum
data rateis115 200 bps.
3.2RS-485 linkconnection
TheDB9Mconnectoris
usedtothelinkconnection
SingleDTE canbe
connectedvia bus
(see fig.)withup to32
partners.
TheRS-485 connectordescriptionandtheinternal passiveterminator:
Contact123456789
Signal TAU1TAU2 TxRx+ RTSpol GND TAU3 T TxRx- +Supp
Internal terminator1k5
TotallycorrectRS-485
bushandlingisshown
inthepicture.RS-485
linkmustbetermina-
tedat bothends.The
resistors(calledpassi-
veterminators)must
beconnectedbetween
AandBwiresand
theirvaluemustbe
100-120 Ω.Theseter-
minatorsareusedfor
theconverter
impedan-ce matching,
theysuppress the
undesi-rableechoand

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theyinfluence thetransferimmunityagainstinterference.
Thethirdwireistheotherimportantcomponentof bus.Thewireinterconnects
theuserssignal groundstherebyeliminatethezeropotentialsdifferences.This
wirehastobeconnectedtoDTEsshields.
Therearealsotheactiveterminators besidethepassiveones.Onlyoneactive
terminatorcanbeinstalledtoonemetallicsectionof thelinkanditsroleis
importantat themomentswhennooneuseristransmittingandall of themarein
highimpedance state(so-calledthethirdstateof thebus).Activeterminatorisan
resistordividerwhichmakesvoltagehigherorequal than200 mVbetweenA and
Bwires.Sometypesof RS-485 receiversdon’tguarantee acorrectinterpretation
of thethirdstate–it mustbetransferredasIDLE. Theactiveterminatorcansolve
thisproblem.Itcanberealizedwithoneinternal resistor680 Ω(jumper7-3) and
oneexternal resistor680 Ωbetween5and8contacts.
3.3Convertersetting
Toworkproperly,theconverterneedstimeoutsetting τ.Forthiscasethereare
contactsTAU1,TAU2andTAU3(numbers1,2and6) ontheRS-485 connector.
Howtousethemisshownat thetablebelow:
Data rate216
4800 notusednotusednotused
9600 notused
19200 notused56k
38400 notused22k
57600 notused10k
115200 notused
WhentheRTScontrolmodeissetit issuitabletominimizethe τinfluence setting
thesmallest τ(connection1-6 forthemaximumdata rate).
IfDTE setsRTSto„ON“polaritypermanently,theconverterwouldhavehis
transmitterswitchedonall thetimeandtheRS-485 linecouldn’tbeshared.In
thiscasetheRTSinfluence canbeswitchedoff bytheconnectionbetween
RTSpol and GND (contacts4-5).ThiswayaRTSpolarityhasbeenchangedand
RTScanbeactiveinthestate„OFF“.
3.4PowerSupplyConnection
TheconvertercanbesuppliedetherthroughtheDCconnector2.35mm,or
throughthecontacts9-5 of theRS-485 connector(DB9M).Thepowertake-off

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fromtheDCsupply6to24 Vmustn’texceed100 mA.Theconverterisprotected
againstthereversingof polarity.
4.0Specifications
4.1Electricalparameters
Interface RS-232 /RS-485
TransmittedsignalsTxDandRxD
ControlRS-232 signalslocal jumpersRTS-CTS
DTR-DSR-DCD
RS-232 connectorDB9F, DCE
RS-485 connectorDB9M
Transmissionmodehalf-duplex, RTSor/RTScontrolled, or
automaticallybytimeconstant0.1to2.5ms
Powersupplyexternal DCsupply6-24V/100mA
Minimum/maxsupplyvoltage6/24 V
ConnectorEIAJ 2.35mm andRS-485 connector
Isolationbetweeninterfaceswithoutgalvanicisolation
Permissibleover-voltageonthethelinemustnotbeexposedtothe
lineunder ČSN 33 0420:atmosphericdischargeinfluences
Requiredlinkimpedance 100Ω
4.2Other
Range1200m, double-wirelink
Maximumtransmissionrate115 200 bps
Minimumdata rateAUT/ RTS4800 /50 bps
Dim.:widthxlengthxheight34 x63 x19 mm
Weight25 g
Stockingtemperature-10 o to+55 o C
Workingtemperature+0oto+50oC
Humidity0–85% (non-condensing)

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!!!CAUTION!!!
Unless otherwisespecifiedontheproduct,asforpermissibleover-voltage,the
convertercanbeusedintheenvironmentswherelightningover-voltageisnot
necessarytobeconsidered.Convertersconnectiontothelinesexposedtothe
atmosphericelectricityinfluencesisprohibitedunless separatelineprotectionis
carriedoute.g. via veryfastlightningarrestor.
5.0Testing
Whenthesupplyisswitchedon, connectpositiveterminal tothe3contactandthe
negativeterminal tothe5contactof theDCpowersupplyof 5to9VontheRS-
232 connector.Thevoltageof c.2-3Vhastobeonthe3-8 contactsof theRS-
485 connector.
6.0Troubleshooting
Symptom Action
ConverterdoesnotworkCheckifthelinkisconnectedproperly
afterinstallationCheckif3-8 contactsarenotchanged
Checkthepowersupply.
CheckRS-232 connectionandRTSpolarity.
Checkifthetimeconstantselectionisright.
Connectioninnormal Checkthepowersupply
operationquit workingCheckthecableconnection
Usethetestaswith5.0
7.0Orderinginformation
SupplycodeisELOE06G.
OrderingcodeforpowersupplyisELOE0Q4. Supplyconnector(forcable)can
besuppliedseparately.

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