Qtech Q71B Quick start guide

Brand
Qtech
Model
Q71B
Type
Quick start guide
Q71B–1200bpsFSKRadioModem
forXL4andDATRANIIeXcelRTUs
QuickStartGuide
Q71B–QuickStartGuide–v1.0–February2013
www.qtech.co.nz Tel:033663713
Overview
TheQ71BmodemallowsyoutoconnectaDATRANRTUviaanRS232serialporttoa
DATRAN1200bpsradiocommunicationssystemusingtheV.23FSKprotocolbutwithout
the backward channel. This allows 1200bps in both directions as the modem is uses a
specialturnaroundfeature.
The Q71B interfaces to either a Tait TM81xx radio (fitted with a Q82 interface), or a
DATRANQ80telemetryradio.
TheradiotypeneedstobespecifiedsoQTechcansupplythecorrectcable.
EachQ71Bissuppliedcompletewitha1mRadiocableanda400mmRS232serialcable.
The Q71B can also simplify radio network upgrades from 300bps to 1200bps as it
removestheneedtochangetheinternalmodemhardware.
Prerequisites
TheDATRANIIeXcelmusthaveQ03firmwarev5.21orlater.
TheQ90softwarerequiredisv3.27orlater.
IfusingtheDATRANXL4RTU,allversionsarecompatible.
AllversionsofWorkbenchsoftwarearecompatible.
Q71B–QuickStartGuide–v1.0–February2013
www.qtech.co.nz Tel:033663713
PowerSupplyConnections
TheQ71Bisdesignedtooperatefromasupplyvoltageintherange8.0VDCto15.0VDC.
Asupplyvoltagegreaterthan15.0Vwillblowthe500mAfuseinsidetheQ71B.
Asupplyvoltagelessthan8.0Vwillresultindegradedorunreliableperformance.
TheDATRANXL4RTUandtheeXcel(RevD)RTUhavetwoRS232ports;bothcanuse
theQ71Bforanalogueradiocommunications.
Thesignificantdifferencebetweenthetwoports,isthatthelowerRS232port(RS232-B)
ontheQ22Dhasa+VsupDCoutputsupplyline.TheQ71Bcanbepoweredviathisline,
solongasjumperJ23ontheQ22Disinthe1-2position.RS232-Aportontheprocessor
doesnothavethissupplyline,sotheQ71Bmustbepoweredthroughthethreeterminal
powersupplyconnector,thepowersupplyconnectionsareshownonthetopcover
LeftPin
MiddlePin
RightPin
G
 PowerSupplyNegative
+ PowerSupplyPositive(8V–15VDC)
Notconnected
 
ThedefaultinstallationpositionoftheQ71BisonthelowerRS232port.
AllnewRTUswillbeconfiguredwiththecorrectjumpersettingforthis.
However,pleasecheckthisjumperonexistingRTUsbeforeusingaQ71B.
IfusingthemodemontheRS232-Aportdonotapplypowerfromboththe
portandtheexternalsupply
IftheDATRANRTUispoweredfroma24VDCsystem:
DonotconnecttheQ71Modemtothis24VDCsupply.
DonotconnecttheQ71modemtotheRS232Aport;usethe12VDCsupply
thattheradiouses&connecttotheQ71powerconnector.
Q71B–QuickStartGuide–v1.0–February2013
www.qtech.co.nz Tel:033663713
Configuration
TheDATRANIIeXcelmustbeconfiguredsothatitwillusetheQ71Bforcommunications.
PoweruptheRTUandconnectQ90softwaretotheRTU.
Navigatetothe“Communications”tabandset“DeviceType”asshownbelow.
TheupperRS232portisconfiguredinthesameway.
Q03RTUConfiguration XL4RTUConfiguration
Diagnostics
TheQ71BhasthreestatusLEDs.
PWR–Power.GreenLEDisonwhenpowerisapplied.
RX–Receive.OrangeLEDinonwhenradiomuteisactive.
TX–Transmit.OrangeLEDisonwhenRTUistransmitting.
IftheGreenPWRLEDisnotoncheckthefuse.
Tuning
Q03RTUTuning
OncetheQ03DhasbeenconfiguredtousetheQ71B,thetransmitaudiosignallevelcan
be adjusted by pressing the “Set TX Level” button in Q90. This will make the Q71B
transmitacontinuoustone,andanACvoltagemetercanbeplacedacrossthepinsofthe
connectorlabelled“LVL”intheQ71B.
Turnthepotentiometeranti-clockwisetoreducethesignallevel
Turnthepotentiometerclockwisetoincreasethesignallevel
Note–thisprocesswillhavealreadybeenperformedaspartofthefactorysetupatQTech
priortodelivery.Thedefaultlevelis-3dBm(548mV)intoa600Ωresistiveload.
XL4RTUTuning
ThisisperformedinaverysimilarmethodtotheaboveQ03processbutviaWorkbench.
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Qtech Q71B Quick start guide

Brand
Qtech
Model
Q71B
Type
Quick start guide
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