Missile Works RRC3 User manual

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
RRC3–RocketRecoveryController3
UserManual

Revision1.60
Missile Works Corporation
PO Box 1725, Lyons CO 80540
www.missileworks.com

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Introduction
Overview

TheRocketRecoveryController3(RRC3)isabarometricdual‐deployaltimeter,withthefeaturesofhigh‐endunits,atthe
costofthosewithamoremodestfeatureset.Inadditiontobasicdual‐deploycapability,theRRC3isamulti‐flightrecording
unit,allowingyoutoflyallday,withouttheneedtostopanddownloaddatainbetweenflights.
Two‐stage(ordual)deploymentispreferabletosingleparachuteorstreamerrecoverysystemsforhigh‐powerrocketry.
Recoveryoflarge,heavyrocketswithasmallparachuteorstreameralonedoesnotsupplyenoughdragtosafelyrecover
therocketwithoutdamage.Anadequatelysizedparachutedeployedatahighaltitudemaycausetherockettodriftoutof
thelauncharea,makingrecoverydifficultifnotimpossible.
Twostage(ordual)deploymentrecoverysystemseitherseparatetherocketairframeintotwosectionsorejectasmall
drogueparachuteorstreameratapogee,allowingtherockettodescendatarapidyetcontrolledrate.Whentherocket
descendstoapredeterminedaltitudeaboveitsinitiallaunchelevation,itthendeploysthemainparachute,allowingthe
rockettomakeasafelanding.
PrimaryFeatures

●DrogueandMainoutputs
●ConfigurableDeploymentoperations
●ConfigurableMainandArmingaltitudes
●User‐selectablebeepfrequency
●Configurablethird"Aux"output
●15flightmemory@~28minutesperflight
●Livedatastreamingandtelemetrycapability
Specifications
Microcontroller16MHz16‐bitMSP430SeriesmCU
OnboardFlightmemory  8MbitSSTFlashMemory
Pressure/Temperaturesensor MSIMS5607Pressuresensorwith24bitΔΣADC
OperationalRanges  StandardUnit(40K/100KMSL)/XtremeUnit(100KMSL)
ArmingModeBarometric
Minimumaltitudeforarming 100feet(adjustable)
Battery3.5voltsto10volts
TestCurrent   17µato50µa(batterydependent)
FiringCurrent3ampsfor1second(Drogue/Main)
Dimensions23.5mmx99.5mm(0.925”x3.917”)
HandlingPrecautions
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AlwayshandletheRRC3inastatic‐free,groundedenvironment
Nevertouch/handletheRRC3whenitisarmedandconnectedtolivepyrotechniccharges
AlwaysallowtheRRC3toadjusttoambienttemperatureconditionspriortoarmingandflying
AlwaysprepareyourrocketandrecoverysystemcomponentswiththeRRC3poweredoff
NevercycletheRRC3powerswitchoff,thenimmediatelybackon(allowatleast10seconds).

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RRC3SystemOptions
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ComputerUSBinterfaceboard,forconfigurationanddatadownloadviamDACSPCsoftware
BluetoothinterfaceboardforSmartphoneconfigurationanddatadownload
LCDinterfaceterminalforfieldconfigurationofunitandfieldreviewofflightdata
ComboGPS/Telemetryboardforlivedownlinkoflocation/datastream
PerfectFliteDT2/DT3interfaceadapterfortheconfiguration/downloadfromRRC3
WiringharnessesforcustominterfaceofCommandAuxiliaryOutput
AuxiliaryPyroExpansionboard,providingadditionaloutputchannelsandtiming
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DefaultBaseSettings
ArmingAltitude300’AGL
MainDeploymentAltitude  500’AGL
DeploymentModeDrogue@Apogee/Main@AGLaltitude
AudioOptionsContinuityBeep
UnitsFeet/Feetpersecond
LowVoltageLockout  Disabled
PiezoTone1.04KHz
DrogueDelay1second(UsedinBackupModeonly)
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NOTE:YoucanresetthesettingsoftheRRC3backtothesedefaultsusingthefollowingprocedure:
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‐PushandHoldtheprogrammingpushbutton.
‐ApplypowertotheRRC3whilethepushbuttonispressed(theLEDwillflicker).
‐Continueholdingdownthepushbuttonforapproximately5seconds.
‐Releasethepushbuttonwhenitbeeps(refertoPOSTcodesintheOperationalModessection).
‐ShuttheRRC3off.

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Installation
AltimeterMounting
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TheRRC3doesnothavean“up”orientation,andcanbemountedinanyconvenientorientation.Itisimportanttomount
thealtimetersecurely,preventingitfromsufferingdamageduringflight.
Whenplanningthelayoutofyouraltimeterbay,inadditiontomountingtheRRC3,besuretoprovidesecuremountingfor
thebattery.Anunsecuredbatterycanbreakfreeduringrecoveryevents,resultingindamagetothealtimeter.
4/40screwhardwareisrecommendedtomounttheRRC3ontothealtimeterbay“sled”oftherocket.Nylonstandoffsor
insulatedwashersarealsorequiredtoprovideclearanceforthebarometricsensorlocatedonthebottomsideofthecircuit
board.
ThealtimeterbaysectionusedfortheRRC3mustbeasealedchamberwithastaticpressureports(seethenextsectionfor
portsizing).Thesealingofthechamberisnecessaryforseveralreasons:
Isolatestheelectronicsfromtheejection‐chargeheat,residue,andover‐pressure
Isolatestheelectronicsfromtheaerodynamicpressureandvacuumduringflight
Providesuniformstaticpressureequilibriumtoambientpressureduringflight
IMPORTANT:Inadequatesealingoftheelectronicsbayorexposureoftheelectronicstoejectionchargeheat,BPresidue,
orpressurewillcausetheRRC3tomalfunction.
IMPORTANT:Blackpowderresidueisextremelycorrosivetothecircuitboardanditscomponents.Alwayscleanoffany
inadvertentresidueimmediatelytoavoidlong‐termdamagetotheunit.
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StaticPressurePorts
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Barometricaltimetersrequireequalizationoftheairpressureinsidethealtimeterbayandtheairpressureoutsidethe
rocket.Toprovidethis,oneormorestaticpressureportsarerequired.Whileoneportcanbeused,toreducespurious
readingsduetowindacrossasingleport,multipleequallyspacedportsisrecommended.
Staticportsshouldbelocatedwheretheyarenotaffectedbyanythingwhichcancauseturbulenceintheairflowoverthe
port.Thisincludesrailbuttons,screwheads,noseconesandtransitions–thefartherthestaticport(s)canbelocatedfrom
suchitems,thebetter.

5
Thesizingofstaticport(s)requiresthatyoufirstcalculatethevolumeoftheelectronicsbayasfollows:
Volume=BayRadius(inches)xBayRadius(inches)xBayLength(inches)x3.14
Next,usetheappropriatesingleportformulatocalculatethesizeofasingleport:
Forvolumes<100SinglePortDiameter(inches)=Volume/400
OR
Forvolumes>=100SinglePortDiameter=2xSQRT(Volume/6397.71)
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Ifyouplantousemultipleports(recommended),determinehowmanyportstouse(aminimumof3isrecommended),
thencalculatethesizeofeachportusingthesemulti‐portformulas:

SinglePortArea=(SingleVentDiameter/2)x(SingleVentDiameter/2)x3.14
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MultiPortDiameter=2xSQRT((SingleVentArea/#ofholes)/3.14)
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PowerandWiringConsiderations
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TheRRC3isdesignedtobeoperatedwithastandard9‐voltalkalinebattery.Standard9Valkalinesareanoptimalchoice,
providinganinexpensiveandwidelyavailablebatterytypewithsecuresnapconnectors.Alwayspurchaseanduse
premiumalkalinebatteries.
Otherbatterytypescanbeused,includingNiCd,NiMH,LiPo,orotherbatterychemistries.Yourbatterychoicemustsource
andmaintainanabsoluteminimumof3.5volts,andalsobelimitedtoamaximumof10volts.
Itshouldbenotedthat9Valkalinebatteriescansourceamaximumdischargecurrentofabout3ampsintoashort.The
Drogue,Main,andAuxoutputsoftheRRC3areratedfor3Aservice.Whenusingotherbatterieschemistriesthatcan
sourcehigherdischargecurrents,usersshouldensuretheoutputconnectionstotheDrogue,Main,andAuxarenot
shorted,andtheconnectedelectronicmatchloadsdonotexceed3Atoavoiddamagingtheunit.

Thebrownoutcapacitorisoptimizedtopreventanover‐currentbrownoutconditionwhenoperatingtheRRC3witha9volt
battery.Lowerbatteryvoltagesreducethetotalbrownouttimecapabilityofthecapacitor.Ifyoudochoosetousealower
voltagebatterythan9V,ensureyourbatteryhasadequatevoltage/powerreservetopreventabrownoutconditionduring
flightduetoavoltagedip,andthatyoupayextraattentiontotheloadsrequiredbyyoure‐matches.
NominalpowerconsumptionfortheRRC3isapproximately6ma.Whenbeepingorflashinghowever,powerconsumption
canjumpupto≈35ma.DuringPre‐launchonthepad,andPostFlightafterrecovery,thealtimeterwillbeepandflashthe
LED.Duringflightoperations,theLEDwillilluminatewhenthevelocitydiscriminatorlockoutconditionsareactive.
IMPORTANT:Alwaysuseabatterysystemof10VoltsorlesstoavoiddamagingtheRRC3
.
IMPORTANT:Alwaysload‐testyourbatterypriortoflighttoensureadequatepowerreserveforreliableoperationand
ignitionoftheejectioncharges.Inadequatesizingofanexternalbatterysystemorhigh‐currentdemandsonthebattery
systemduringeventinitiationmayleadtopowerandprocessorbrown‐outconditions,resultinginrecoveryfailure.

6
Inaddition,itisimportanttopayattentiontobatterypolarity–thepositiveterminalonthebatterymustbeconnectedto
thepositiveterminal(markedwitha+sign)onthealtimeter.Connectingthebatterybackwardswillnotdamagetheunit,
howeverthealtimeterwon’toperate.
Stranded20‐22AWGwireisrecommendedforthebatteryandpowerswitchterminals.

PowerSwitchConsiderations
Inadditiontoprovidingapowersource,apowerswitchshouldbeconnectedtotheswitchterminals(nexttothepower
terminals)onthealtimeter.Theswitchusedcanbeassimpleasapairofwireswhicharetwistedtogetherpriortoflight
(i.e.“twistandtape”),orascomplexasamagneticallyactivatedsolid‐stateswitch.
Switcheswhichprovidedpositive,bounce‐freecontact,suchastwistedwires,highqualityrotaryorleverswitches,push
on/off,andscrewswitches,arerecommendedfortheirsimplicityandreliability.
Ifyoudousethe“twistandtape”method,pleaseusethefollowingguidelines:
 DoNotpokethewiresbackintotheairframeaftermakingaconnection.Whenthewiresarepokedbackintothe
airframe,thiscreatesasafetyissueshouldtherocketneedtobedisarmedandremovedfromthepadforanyreason,
asitisdifficult,ifnotimpossible,tofishthewiresbackoutofthehole.

 Maintainpositivecontactofthestrippedwireendswhiletwistingthemtogethertoavoidpowerbobbleswhichcan
leadtobrownoutsorotherundesiredresults,includingpotentialoutputeventactivationsduetopotentialundefined
statesofoperation.

 Itisbesttotapetheleads,aftertwistingthem,thentapethemtotheairframe,orpoketheendintoanotherholeon
theairframe,leavingalengthofwireexposedandaccessibleontheoutsideoftheairframe.
Ifyourusingan“active”switchthatsourcespowerandispolaritydependent,the(+)batterypowerswitchterminalis
locatedadjacenttothebatterynegativeterminal.Theswitched(+)powerterminalistheotherswitchterminal.

DrogueandMainEjectionChargeConnections
TheRRC3isdesignedtobeusedwithlowcurrentelectricmatches(Daveyfire,Oxral,MTEK,JTEK),orlowcurrentmotor
igniters(QuestQ2G2).
It’salsoextremelyimportantthatyoupayattentionandvalidatethatyouconnectyourdrogueejectionchargetothe
drogueterminalsandthemainejectionchargetothemainterminals.Theseterminalsareclearlymarkedontheboard
withpositiveandnegativedesignations.

TheRRC3employstheuseofan“OpenDrainMosFET”devicetoactivatetheejectioncharges.Thebatteryvoltageis
alwayspresentonthe(+)terminalwhilepowerisappliedtotheRRC3,andthe(‐)terminalisahighresistanceconnection
thatpreventsanycurrentflowuntiltheMosFETisgatedonattheappropriateeventtime.

7
IMPORTANT:NEVERattachliveejectionchargeswiththealtimeterpoweredON.Alwaysconnectliveejectioncharges
withthealtimeterpoweredOFF.
Alwayspre‐measureyourdeploymentchargematchesorignitersforanominalresistanceandverifytheyarenotshorted.
Anominalresistanceforalowcurrentdeviceshouldbeintherangeof1to2ohms.

AtthePad

Atthelaunchpad,beginbyplacingyourrocketonthepad/rail,andraisingtherockettothevertical(launch)position.Do
notinstalltheigniteratthistime.
Beforeyouarmthealtimeter,havebystandersremovethemselvestoasafedistancewheretheywillnotbeinjured,should
theejectionchargesfireprematurely.
Turnonthearmingswitchforthealtimeter,andlistenforthestartupsequence.Thealtimeterstartupsequenceisas
follows:
1. 5secondlongbeep(initmode)
2. 10secondbarohistoryinittime(silence)
3. Settingsbeep(whenenabled)orPOSTfaultcodebeep(ifafault,seePOSTfaultcodes)
4. 10secondlaunchcommittesttime(silence)
5. LaunchDetectmode(continuitybeeps)
a. Alongbeepindicatesnocontinuityonanyeventterminal.
b. Oneshortbeepindicatescontinuityononlythedrogueterminal.
c. Twoshortbeepsindicatecontinuityononlythemainterminal.
d. Threeshortbeepsindicatecontinuityonthemainanddrogueterminals.
Assumingthealtimeterbeepsouttheexpectedcontinuitystatus,youraltimeterisreadyforlaunch.Atthispoint,you
shouldinstalltheigniter,connecttheigniterleads,andleavethearea.
Shouldtherebeaneedtoremovetherocketfromthepad,orotherwisechangeitsposition,beginbydisconnectingand
removingtheigniter.Then,turnoffthearmingswitchforthealtimeter,andwaitaminimumof10secondsafterthe
altimeterstopsbeepingbeforemovingtherocket.

AnalyzingYourFlight

Afteryourflight,thealtimeterwillbeep/flashoutyourpeakaltitudeusinga"perdigit"method.Forexample,let'ssayyour
rocketflewtoapeakaltitudeof2,340feet.You'dhearthefollowingbeepsequence:
beep‐beep(2),shortpause
beep‐beep‐beep(3),shortpause
beep‐beep‐beep‐beep(4),shortpause
beeeeeeeeeeeeeeeep(0),shortpause

8
Shortlowtonebeep(endofaudiovaluereport)
Longpause(beepingwillrepeat)
Thealtimeterwillcontinuetobeepasdescribeduntilpoweredoff.Thereareadditionalflightdataitemsyoucanenableto
beepaftereachflight(seethe"AudioOptions"settingintheAdvancedOperationsection).

OperatingTipsforSuccess
Alwayspre‐testyouraltimeterasCOMPLETELYaspossiblepriortoeveryflight.Thisincludesatestoftheinputs,
outputs,andbarosystem.ThesetestscanbeperformedusingthediagnosticscapabilityoftheRRC3(seetheAdvanced
Operationsection).

Alwayspre‐testyourbatteriesbeforeeachflightandensuretheyhaveadequatepowercapacityfortheanticipated
worstcaseflightprofile,includingunplanned“on‐the‐pad”waitingtime.

Alwayspre‐measureyourdeploymentchargeinitiators.Measurethemforanominalresistanceandverifytheyarenot
shorted.

Properport‐sizingcreatesidealequilibriumrates.Ensurethatyourportingiscompliantwiththerecommendedsizing.
Improperlysizedportingorotherleaksintheelectronicsbaycancreateparasiticpressureeffects,impacting
equilibriumratesandreliablerecovery.

AdvancedFeaturesandOperation
TheRRC3providesanumberofadvancedfeaturesandoperationswhilestillmaintainingandprovidingthebasicsofsimple
andreliabledualeventrecoveryandpeakaltitudedetermination.Theseadvancedfeaturesareeasilyaccessible,butdo
notinterfereorgetinthewayofthebasicfunctionsthattheRRC3provides.

DualBatteryWiring
TheRRC3isdesignedtoflyusing9Valkalinebatteriesintandemwithlowcurrentematchesforthedrogueandmain
deploymentcharges.Shouldyourapplicationrequirehighercurrentforoutputevents,oryouroperatingatlowerbattery
voltagesyoumightconsiderusingadualbatterywiringsetup.ThismethodisolatestheRRC3LogicBatterypowerfromthe
Drogue/MainDeploymentchargepower,thuseliminatinganypotentialvoltagebrown‐outscenariosduringevent
activation.Thelogicbatterymustcomplywiththe3.5VDCto10VDCratingasmentionedinthespecs;howeveryourpyro
batterymaybeanyvoltageuptoanabsolutemaximumof30VDC.
ItisalsorecommendedwhenusingthisdualbatteryoperationtofirstactivatetheRRC3LogicSwitch,andafterverification
ofasuccessfulboot,thenactivatethePyroSwitch.


9
Whenusingdualbatteries,usethefollowingwiringdiagramasaguide.


RRC3OperationalModes
TheRRC3‐minihasseveraldistinctmodesthroughoutthecourseofitsoperationduringflightandrecovery.Thesemodes
ofoperationareidentifiedbythefunctionofthepiezoandtheLED,andthespecificphaseofflight.

PowerUpandPre‐LaunchModes

Power‐upInitializationMode
Whenpowerisfirstappliedtotheunit,itwillprovideacontinuous5‐secondbeeptoindicateithasbeenswitchedon.
Duringthis5‐secondtimeperiod,theRRC3islookingforatapofthe“Program”button(invokingtheDIPSwitchOperations
Mode)TheLEDwillremainoncontinuouslyduringthePower‐upInitializationMode.

BaroHistoryInitializationMode
AfterthePower‐upInitializationmode,theunitgoesthrougha10‐secondbaroinitializationstart‐updelay.TheLEDwill
flashonandoffevery2secondswhileinthismode.Thisdelayperiodallowsbarometricstabilizationandestablishesan
initialbarometrichistory.TheRRC3alsolooksfora“HostConnection”messagefromahostPCcomputer(attemptingto
connectinHostorSimulationModes).TheseoperationsarecoveredinsubsequentmDACSUserManual.

POSTMode(PowerOnSelfTest)
Onceabarometrichistoryisestablished,theRRC3performsseveralPOSTcheckstovalidatetheintegrityofallsensorsand
tocheckthecurrentambientenvironmentalconditions(pressureandtemperature).

Ifthereareanydetectedsystemwarningsorfaults,orconditionsthatfalloutsideofspecifiedranges,thealtimeterentersa
POSTFaultCodeloop,whereitrepeatedlyreportsthespecificfaultthatitencountered.TheRRC3isunabletoflyuntilthe
faultorwarningiscorrected.

POSTFaultCodesareprecededbyaverydistinctwarningtone(7veryquicklowbeeps),followedbythebeepingand
flashingofthespecificfaultcode.

10
ThefollowinglistsallPOSTFaultCodeconditions:

POSTFaultCodeDescription
1 UserinvokedSettingsDefaulttoFactorySettingswarning
2 LCDTerminalFault/LCDisattachedandaDIPSwitchisON
3 BarometricsensorFault/Nocommunicationreply
4 BarometricsensorFault/PromCRCMismatch
5 BarometricpressureFault/Pressure<10mbaror>1200mbar
6 TemperatureFault/Temperature<‐40deg.Cor>85deg.C
7 LowBatteryLockoutFault/Battery<LowVoltageLockoutLevel
8 AmbientBarometricFault/UnstableconditionsduringLaunchCommitTest

POSTCodeNotes:
‐Code1isbeeped/flashedwhenevertheuserperformsaFactoryDefaultOperation.
‐Code2isbeepedflashedifyouconnecttheLCDTerminalwithaDIPSwitchintheONposition.
‐Codes3thru6indicateahardwarefault.ContactMissileWorksforwarrantyorservicedetails.
‐Code7indicatesthebatteryisat/belowthespecifiedLowVoltageLockout.Replaceyourbattery.
‐Code8indicatesthatambientbaroconditionsareunstableforthecurrentlyprogrammedArmingAltitude.Eitherraise
theArmingAltitudesetting,orconsiderflyinginmorestableconditions.

AudioOptionsReportMode
IfyouhaveenabledanyofthePre‐LaunchAudiooptionsoftheRRC3,theywillbebeeped/flashedatthisstageof
operations.Theseaudiooptionsincludebeeping/flashingofbatteryvoltageandDeploymentmodes.(seethefollowing
“BaseSettings”sectionifthemanualformoredetails).

LaunchCommitTest
TheLaunchCommitTestisa10secondtestoperationthatisa“trialrun”oftheLaunchDetectMode,applyingthe
currentlyprogrammedArmingAltitudeagainstambientconditions.ShouldambientconditionsbesuchthataLaunch
Detectconditionisvalidduringthistestperiod,theRRC3willinvokeaPOSTCode8condition(seeabove).Duringthe
LaunchCommitTest,theLEDflashesonandoffata1secondrate.

LaunchDetectMode
Whenallpreviousmodesarecomplete,theunittransitionsintoLaunchDetectMode.ThepiezoandtheLEDwill
beep/flashtoindicatethecontinuitystatusofthedrogueandmainoutputterminalsevery5secondsasfollows:
LongBeep/FlashNocontinuityonDrogueorMain
1ShortBeep ContinuityonDrogueonly
2ShortBeeps ContinuityonMainonly
3ShortBeeps ContinuityonDrogueandMain

TheRRC3monitorsthebarometricsensorforachangeinaltitudeasspecifiedbythecurrentArmingAltitudesettingto
determinethelaunchoftherocket.AssoonthethecurrentaltitudeexceedstheArmingAltitude,theRRC3isactivated
andLaunchDetectisdeclared.


11
In‐FlightOperationalModes

ApogeeDetectionMode
WhiletheRRC3isactivelysamplingthebarometricsensortodetermineapogeeandsubsequentDrogueEvent,boththe
LEDandPiezowillbeOFF.Whentheunitdeterminesthatapogeehasoccurred(byreachingadisplacementvelocityof0ft
persecond)itwillinitiatetheDrogueEvent.TheMainEventmayalsoactivateatapogeebasedupontheconfigurationof
theDeploymentModesetting(seethefollowing“BaseSettings”sectionifthemanualformoredetails).

MainDetectionMode
AftertheRRC3hasdetectedapogee,itwilltransitiontotheMainDetectionMode.Theunitwillcontinuetosample
barometricpressureduringthedescentphaseoftheflightuntilitreachesthedesignatedMainAltitudesetting.

LandingDetectionMode
OncetheMainEventhasoccurred,theRRC3startsmonitoringforaLandingEvent.TheLandingEventoccurswhencurrent
velocity>‐3ft.persecondforaminimumof2seconds.

Post‐FlightOperationalMode

AfterLandingDetection,theRRC3willreportthepeakaltitudeitmeasuredduringflight.ThepiezoandtheLEDwill
continuouslyreportthepeakaltitudebybeeping/flashingouttheindividualdigitsofthemeasurement.Dependingonthe
peakaltitude,theunitwillchirpout3,4,5,or6digits.ShouldyouhaveenabledanyadditionalPostFlightAudioOptions
(Peakvelocityand/orTimetoApogee),theywillbeeped/flashedhereaswell.TheRRC3willcontinuetobeep/flashthis
datauntilpoweredoff,andrepeatthecycleevery10seconds.

BaseSettings
TheRRC3”BaseSettings”areacollectionofsettingsandcontrolsthatprovideallthebasicfunctionsofthealtimeter.The
followinglistdefinestheBaseSettingsoftheRRC3:

ArmingAltitude
Range:10to30(100ft.to300ft.)/Default:30
ThissettingestablishestheminimumAGLaltitude(infeet)requiredforthealtimetertoarmitselfforflightoperationsand
tocommencethewithdroguechuteandmainchuterecoverycontrols.Thesettingisenteredin10ft.increments.

MainDeploymentAltitude Range:3to30(300ft.to3000ft.)/Default:5
ThissettingdefinestheAGLaltitude(infeet)atwhichthemaindeploymenteventisactivatedduringthedescentphaseof
therecovery.Themaindeploymenteventisalwaysprecededbythedroguedeploymentevent.Thesettingisenteredin
100ft.increments.

DeploymentMode   Range:1to3/Default:1
TheDeploymentModesettingdefineshowandwhenthealtimeteractivatesthedrogueandmaindeploymentevents
duringaflight.Thereare3distinctdeploymentmodes:
1. DualDeployPrimaryDrogue@Apogee/Main@MainDeploymentAltitude
2. DualDeployBackup Drogue@Apogee+DrogueDelay/Main@DeploymentAltitude
3. ApogeeOnly  Drogue@Apogee/Main@Apogee+1sec


12
AudioOptionsRange:1to32/Default:32
TheAudioOptionssettingcontrolshowtheonboardpiezo/beeperisutilizedthroughoutflightoperations.Asidefromthe
drogueormainactivation,activatingthepiezoitisthesingle‐mostbatteryintensivetaskthealtimeterperforms.The
settingisspecifiedinabinary‐basedvalueaccordingtothefollowingtable:

BeepBatteryVoltage(X.Xvolts)Pre‐LaunchSettingValue+1
BeepDeploymentModeandMainAltitudePre‐LaunchSettingValue+2
EnablePadPowerSaverMode(disablecontinuitybeeps)SettingValue+4
BeepPeakFlightVelocityPost‐FlightSettingValue+8
BeepTimetoApogee(seconds)Post‐FlightSettingValue+16
DisableallAudioOptionsSettingValue+32

Forexample,ifyouwantedtobeepthePre‐LaunchBatteryVoltage(+1)andinaddition,employtheuseofthePadPower
SaverMode(+4),youwouldsettheAudioOptionssettingto(5).

Alloftheaudiooptionsettingsarebasicallyself‐explanatory;theexceptionhoweveristhePadPowerSaverMode.Ifthis
optionisenabled,thecontinuitybeepingyouhearinitiallyinLaunchDetectModewillstopafter5minutes.Inplaceof
continuitybeeping,thealtimeterwillemit1short“beep”every15secondstoindicateitisarmedandinlaunchdetect
mode,savingalotofbatterypowerforyourinevitablepadwaittimeandsubsequentflight.

Audio/LCD/TelemetryUnits Range:1to4/Default:1
TheUnitssettingdetermineshowtheRRC3willreportalltheflightperformancevalues.Thissettingappliestoallformsof
datareporting(theaudio“beeping”,thedatadisplayedontheoptionalLCDterminal,andthevaluestransmittedinflight
viathetelemetrycapability).Chooseasettingthatismostappropriateforyouasfollows:

1. ImperialUnits(feet,degF)/Velocity(feetpersecond/fps)
2. MetricUnits(meters,degC)/Velocity(Kilometersperhour/KPH)
3. ImperialUnits(feet,degF)/Velocity(Milesperhour/MPH)
4. MetricUnits(meters,degC)/Velocity(meterspersecond/mps)

LowVoltageLockoutLevel  Range:2to9/Default:2
ThissettingwillvalidatetheRRC3batteryvoltageisaboveaminimumvoltagelevelthat’sappropriateforyourbattery
system.Asettingof(2)disablesthislockoutfeature.Ifthislockoutfeatureisenabled,andthebatteryvoltageisator
belowthespecifiedsetting,theunitwillnotarmitselfforflight,andinsteadactivatethePOSTfaultcodereportmode(see
thePOSTfaultcodes)

PiezoToneRange:2to12/Default:12
Thissettingdeterminesthefrequencythepiezo“beeper”willoperateat.Thelowestsettingwillresultinahigher
frequency(6.25KHz),andthehighestsettingresultsinthelowestfrequency(1.04KHz).Usethiswhenmultipleelectronics
areonboardyourrockettodistinguishthebeepingofoneunitfromanother,ortoadjustthetonetoafrequencythatyou
canhear.


13
DrogueDelayRange:1to30/Default:1
TheDrogueDelayisusedwheneveryouhaveselectedaDeploymentModesettingofDualDeployBackup.Inallother
casesthissettingsisnotused.WhenevertheRRC3isdesignatedinabackuprolewhenusingredundantaltimetersystems,
youcandelaytheRRC3Drogueeventusingthissetting.Shouldthisdelaysettingbesetforalongperiod,andtheRRC3
determinestheMainEventrequiresactivation;theRRC3willalsooverridetheDrogueDelaytimerandactivatetheDrogue
Event.Thesettingisenteredinseconds.

DIPswitchandpushbuttonoperations

SettingtheRRC3viaDIPswitchandpushbutton
AccesstoalltheBaseSettingsismadeavailableviatheRRC3DIPswitchandpushbuttoninterface.Thevalueofallthese
settingscanbeverifiedorreconfiguredatanytimewithouttheuseoftheoptionalLCDTerminalormDACSPCSoftware
andUSBInterfacemodule.
Inadditiontoprovidingaccesstoallthesesettings,theDIPswitchandpushbuttoninterfacecanalsoprovideaccesstothe
altimeterresidentFlightLogdataandaninteractiveTestModethatcanvalidatebasicoperationalintegrityoftheRRC3
(thesearecoveredinthesubsequentmanualsection).DIPSwitch4determinesthisbasicselectionofSettingsaccess,or
FlightLog/TestModeaccess.
Tostartasettingsession,ensuretheRRC3ispoweredoff,andthatithasabatteryandpowerswitchattachedandread.
AlsoensuretheDIPswitch4isintheOFFposition.
ApplypowertotheRRC3byactivatingthepowerswitch.Youshouldhearthestartofthe5second“init”tone.Atany
pointduringthis5secondtone,tapthePROGRAMbutton.ThebeeperandLEDshouldgoout,andtheunitwillbeginits
BaseSettingsoperation.
ThepositionofDIPSwitches1thru3determineswhichofthe8BaseSettingsthatyouwanttoverify,orre‐program.The
BaseSettingsoperationfollowsasimpleprocessflow:
1. TheRRC3readsthepositionofDIPSwitches.
2. TheRRC3beeps/flashesthecurrentvalueoftheassociatedsetting.
3. TheRRC3pausesfor5seconds,andthenrepeatsStep1.
YoucanchangeDIPSwitches1thru3atanytimetoselectanewsettingforverification.Usingthisprocess,youcan
validatethevaluesofall8BaseSettings.TheDIPswitch/Settingspositionsare:
SW1SW2SW3
OFFOFFOFF ArmingAltitude
ON OFFOFF MainDeploymentAltitude
OFF ON OFF DeploymentMode
ON ON OFF AudioOptions
OFFOFF ONAudio/LCD/TelemetryUnits
ON OFF ON LowVoltageLockout/AlarmLevel
OFF ON ON PiezoTone
ON ONON DrogueDelay

14
Step3oftheaboveprocessflowiswhatwe’llrefertoasthe“ProgrammingPause”.Ifyouwanttore‐programthesetting
youcurrentlyhaveselected,youwouldtapinanewvalueduringthispausetime.Let’ssayyouwantedtore‐programthe
MainAltitudesettingfromthedefaultof500’to1000’.
Herearethestepsyou’dperform:
SelecttheMainAltitudeSettingviaDIPSwitch(1ON/2OFF/3OFF)
Verifythecurrentsettingvalueof5viabeep/flash
Duringthe“ProgrammingPause”,taptheProgrampushbutton10times
TheRRC3shouldprovideadouble‐beep“acknowledgetone”(newsettingissaved)
VerifytheNEWsettingvalueof10viabeep/flash(10x100’=1000’)
Done...Programmingcomplete!
Repeatthesequenceagainshouldyouwanttochangeittosomethingelse,orselectanewsettingviaDIPswitchtoverify
orchange.Whenyou'redone,simplypowerofftheRRC3.It’snowreadytoflywiththenewlyprogrammedsettings.

AccessingtheRRC3FlightLogviaDIPswitchandpushbutton
Asmentionedintheprevioussection,theDIPswitchandpushbuttoninterfacecanalsoprovideaccesstothealtimeter
residentFlightLogdata.
TostartaFlightLogsession,ensuretheRRC3ispoweredoff,andthatithasabatteryandpowerswitchattachedand
ready.AlsoensuretheDIPswitch4isintheONposition.
ApplypowertotheRRC3byactivatingthepowerswitch.Youshouldhearthestartofthe5second“init”tone.Atany
pointduringthis5secondtone,tapthePROGRAMbutton.ThebeeperandLEDshouldgoout,andtheunitwillbeginits
FlightLog/Diagnosticoperation.
ThepositionofDIPSwitches1thru3determineswhichofthe6FlightLogitemsthatyouwanttoreview.TheFlight
Log/Diagnosticoperationfollowsasimpleprocessflow:
1. TheRRC3readsthepositionofDIPSwitches.
2. TheRRC3beeps/flashesthevalueoftheassociatedFlightLog/Diagnosticitem(s).
3. TheRRC3pausesfor5seconds,andthenrepeatsStep1.
YoucanchangeDIPSwitches1thru3atanytimetoselectanewitemforreview.Usingthisprocess,youcanreview/select
all6FlightLogitems.TheFlightLogDIPswitchpositionsare:
SW1SW2SW3
OFFOFFOFF PeakAltitudeAGL
ON OFFOFF PeakVelocity
OFF ON OFF TimetoApogee
ON ON OFF TotalDescentTime

15
OFFOFF ONDrogueDescentRateAverage
ON OFF ON MainDescentRateAverage
TheRRC3FlightLogdataalwayscontainsthedatafromthelastflight.Eachnewflightoverwritesthepriorflight
information.TheitemsintheFlightLogareallbeeped/flashedintheappropriate“units”assetbytheAudio/LCD/
TelemetryUnitssettingasdescribedinthepreviousBaseSettingssection.

RRC3DiagnosticsandTestingviaDIPswitchandpushbutton

Thereare2DiagnosticModesavailablethattheRRC3supportswhileintheFlightLogDIPSwitchmode.Startinthesame
mannerdescribedintheabovesection.SettheDIPswitchesasfollows:

SW1SW2SW3
OFF ON ON Diagnostic/BaroMillibars,Temperature,Firmwareversion
ON ONON Diagnostic/ContinuityInputs&AllOutputsTest
TheBaro/Temperaturediagnosticwillreadtheambientbaroandtemperaturedatadirectlyfromtheonboardsensor,and
thenbeep/flashaccordingly.Temperatureisbeeped/flashedintheappropriate“units”assetbytheAudio/LCD/
TelemetryUnitssettingasdescribedinthepreviousBaseSettingssection.Lastly,thisdiagnosticwrapsupbybeepingthe
currentRRC3firmwarebuildversion.IttakestheformofX.x,allowingyouvalidatetheactivebuildyouarerunning.Use
thisDiagnostictoquicklyvalidateandtesttheoperationalintegrityofthebarometricsensorsystem.
TheContinuityInputsdiagnosticwillreadthestatusoftheDrogue,Main,andAuxiliaryandthenbeep/flashtheinputstatus
accordingly.Thistestmimicsthesamecontinuitystatusbeeping/flashingwhileinLaunchDetectMode:
LongBeep/FlashNocontinuityonDrogue,Main,orAux
1ShortBeep ContinuityonDrogueonly
2ShortBeeps ContinuityonMainonly
3ShortBeeps ContinuityonDrogueandMainonly
4ShortBeeps ContinuityonAuxiliaryonly
5ShortBeeps ContinuityonDrogueandAuxiliaryonly
6ShortBeeps ContinuityonMainandAuxiliaryonly
7ShortBeeps ContinuityonDrogue,Main,andAuxiliary

Atanypointduringthisdiagnostic,ifyoutapthe“Program”button,youwillsimultaneouslyactivateall3outputs(Drogue,
Main,andAuxiliary)forthestandard1secondactivationtimeusedbytheFlightcontrols.

IMPORTANT:ALWAYSUSEEXTREMECAUTIONandensurethatyouhaveNOLIVEPYROCHARGESattachedtoRRC3
whenactivatingthisOutputtestoperation.

AdvancedSettings
Inadditiontothe8BaseSettingsmentionedinthepreviousmanualsection,theRRC3providesacollectionofAdvanced
SettingsthatcontroltheoperationofIn‐FlightTelemetry,andtheAuxiliaryOutputwhichcanbeusedforahostof
extendedcontroloperations.

16
Itshouldbenotedthataccesstoallofthesesettingsisaccomplishedbyuseoftheoptionalplug‐inLCDTerminalaccessory,
orbyuseoftheUSBInterfacemoduleandmDACSPCSoftwareapplicationonly.Thesesettingsareunavailablethroughthe
DIPSwitchinterface.UsageoftheLCDandmDACSinterfacesarecoveredintheirrespectiveUserManuals.
FlightTelemetryandSettings
TheRRC3providestheabilitytostreamlivetelemetrydataviatheonboard5‐pinCommPort.Theupdaterateandcontent
ofthisdatastreamareconfigurableformanydifferentapplications,includingdatadownlinking,datalogging,ordigital
controlofotheronboardavionicsdevices.Thedatastreamisoutputatuserprogrammableintervalsfromtheprimary
UARToftheRRC3mCUinaserialpacketformatasfollows:
‐9600BPSAsynchronous
‐8Databits
‐NoParitybit
‐1Stopbit
AlldataitemsinthestreamareinanASCIIformatareindividuallycommadelimited,andeachpacketisterminatedviaa
standardCarriageReturncharacter(0Dh).

DataControls
ThissettingenablesthetelemetrystreamfeatureoftheRRC3.Setthisaccordingtothespecificrequirementsforyourdata
stream:
LCDSettingValueSettingDescription
0 NoTelemetry/Disabled
1 TelemetryPre‐Launch@0.5secpacketupdaterate
2 TelemetryPre‐Launch@1.0secpacketupdaterate
3 TelemetryPost‐Launch@0.5secpacketupdaterate
4 TelemetryPost‐Launch@1.0secpacketupdaterate
DataItems
Thissettingcontrolswhichdataitemswillbeincludedinthetelemetrystream.Setthisaccordingtothespecificdataitems
yourapplicationrequires.Thefollowingtabledescribesthepacketorderprecedence,formats,andassociatedbinary‐based
valuesofalltheavailabledataitems:
Order  Item  Format(maxcharacters)LCDValue
1TimestampXXXX.XsecondsSettingValue+1
2AGLAltitude+/‐XXXXX(feet/meters)SettingValue+2
3Velocity+/‐XXXX(fps/mps/MPH/KPH)SettingValue+4
4Temperature+/‐XXX(degF/degC)SettingValue+8
5Events(v1.5x) ‐‐‐/DMA/dma(EventStatusOnly)SettingValue+16
5Events(v1.6x)???/dma/DMA(ContinuityandEventStatus)SettingValue+16
6BatteryVoltage*X.XvoltsSettingValue+32
*v1.60FirmwareOnly

17

Notes:
‐Altitude,Velocity,andTemperatureitemsarescaledandformattedaccordingtotheAudio/LCD/TelemetryUnitssetting.

‐EvenwhensomeDataItemsareomittedfromthedatastream,theDataItemOrderprecedencestillremainsasspecified.

‐Eventsarestreamedusingthe“‐”characterpriortotheactivationoftheevent,useanuppercasecharacterwhilethe
eventisACTIVE,andusealowercasecharacterpost‐activation.

CommPortPinout
TheRRC3CommPortisreservedforconnectionwiththeUSB‐IO,theBTMMModule,ora“tetherconnection’toan
RTx/GPSsystem.Here’stheCommsocketdiagramifyou’reinterestedinconnectinginyourownproject:


AuxOutputControlSettings
TheAuxOutputControlSettingsprovideanextremelyflexibleandcapablecollectionofcontroloptions,allowingusersto
createacustomcontrolsequenceindependentofthestandarddrogueandmainfunctionsperformedbytheRRC3.
Thesesettingsprovideaframeworkthatallowsyoutodesignanoutput“controlsequence”viathedefinitionofa
“serializedflow”ofoperations.Withoneexception,allAuxcontrolsequenceshavea“triggerevent”thatinitiatesthe
controlsequence.Whenthistriggereventisvalid/true,optionalsecondaryandtertiarycontrolsorconditionalsare
evaluatedforvalidityaswell.
AccesstotheAuxOutputControlSettingsisonlyavailableviatheoptionalplug‐inLCDTerminalaccessory,orbyuseofthe
USBInterfacemoduleandmDACSPCSoftwareapplication.
AuxOutputControlSequence(OCS)
TheOCS(OutputControlSequence)settingiswhatdefinestheserializedcontrolsequenceusedbytheRRC3.Italsoserves
asamasterenable/disablefeature,meaningthatregardlessofsecondaryandtertiarysettingsthatmaybedefined,when
theOCSissetto“Disabled”,theentireOCSoperationisdisabled.TheOCSsettingsareasfollows:

18
LCDSettingValueSettingDescription
0 Disabled‐OCSandAuxControlsareinactive
1 LEDSync‐SyncstheAuxOutputwiththeLED
2 EventOnly‐Auxisactivatedbytriggerevent
3 Event‐>Timer‐Auxisactiveviatriggerandtimer
4 Event‐>LoopComparator‐Auxisconditionalusingtriggerandcomparator
5 Event‐>Timer‐>LoopComparator‐Auxrequiresallthreeconditionals
6 Event‐>LoopComparator‐>Timer‐Auxrequiresallthreeconditionals
7 Event‐>1‐ShotComparator‐Auxisconditionalusingtriggerandcomparator
8 Event‐>Timer‐>1‐ShotComparator‐Auxrequiresallthreeconditionals
9 Event‐>1‐ShotComparator‐>Timer‐Auxrequiresallthreeconditionals


LEDSync
UsethisOCSsettingifyouwanttodriveanexternalLED,Light,Buzzer,Beeper,Transmitterorsimilardevice.Anytimethe
onboardLEDison,soistheAuxOutput.
EventOnly
ThissettingisthemostbasicofallAuxOCSoperations.Itfunctionsverysimply...whentheTriggerEventisTRUE,theAux
Outputisactivated.

Event‐>Timer
ThisAuxOCSsettingcombinestheTriggerEventwithanensuingtimeroperation.Thetimerstartsimmediatelyupon
activationoftheTriggerEvent.Whenthetimerintervalexpires,theAuxOutputisactivated.
Event‐>LoopComparator
ThisAuxOCSsettingcombinestheTriggerEventwithanensuingLoopComparatoroperation.OncetheTriggerEventis
activated,theComparatoristhenevaluatedforvaliditycontinuouslyaslongasthetriggereventremainsvalid.Ifthe
comparatorresultisvalid,thentheAuxOutputisactivated.
Event‐>Timer‐>LoopComparator
ThisAuxOCSsettingcombinestheTriggerEventwithanensuingtimer,andafterexpirationthereof,itbeginsaLoop
Comparatoroperation.ThetimerstartsimmediatelyuponactivationoftheTriggerEvent.Whenthetimerintervalexpires,
theComparatoristhenevaluatedcontinuouslyforvalidityaslongasthetriggereventremainsvalid.Ifthecomparator
resultisvalid,thentheAuxOutputisactivated.
Event‐>LoopComparator‐>Timer
ThisAuxOCSsettingcombinestheTriggerEventwithanensuingLoopComparator,andaftervalidationthereof,atimer
operationbegins.WhiletheTriggerEventisactive,theComparatorisevaluatedcontinuouslyforvalidity.Thetimerstarts
immediatelyuponvalidityoftheComparator.Whenthetimerintervalexpires,theAuxOutputisactivated.

Event‐>1‐ShotComparator
ThisAuxOCSsettingcombinestheTriggerEventwithanensuing1‐ShotComparatoroperation.OncetheTriggerEventis
activated,theComparatorisevaluatedforvalidityonlyonetime.Ifthecomparatorresultisvalid,thentheAuxOutputis
activated.

19
Event‐>Timer‐>1‐ShotComparator
ThisAuxOCSsettingcombinestheTriggerEventwithanensuingtimer,andafterexpirationthereof,itevaluatesthe1‐Shot
Comparatoroperation.ThetimerstartsimmediatelyuponactivationoftheTriggerEvent.Whenthetimerintervalexpires,
theComparatorisevaluatedforvalidityjustonetime.Ifthecomparatorresultisvalid,thentheAuxOutputisactivated.
Event‐>1‐ShotComparator‐>Timer
ThisAuxOCSsettingcombinestheTriggerEventwithanensuing1‐ShotComparator,andaftervalidationthereof,atimer
operationbegins.WhentheTriggerEventbecomesactive,theComparatorisevaluatedonlyonetimeforvalidity.The
timerstartsimmediatelyuponvalidityoftheComparator.Whenthetimerintervalexpires,theAuxOutputisactivated.

AuxiliaryTriggerEvent
WiththeexceptionoftheLEDSyncoperation,thetriggereventiswhatinitiatesanyAuxOutputControlSequence.The
triggereventrepresentsthespecificphaseoftheRRC3Flightthatyouwanttoapplythecontrolsequenceto.Whenthat
phaseoftheflightisreached,theTriggerEventissatisfiedandtheensuingcontrolsequencecanbeevaluated.TheTrigger
Eventsareasfollows:
LCDSettingValueSettingDescription
0 Disabled‐Notriggereventisdefined
1 Launch‐Altitude>ArmingAltitudeandunithasnotreachedapogee
2 Apogee‐ApogeewasdetectedandAltitude>MainAltitude
3 Main‐Mainwasdeployedandunithasnotlanded
4 Landing‐Unithaslanded

AuxiliaryComparatorOperation
WhenevertheComparatorisrequiredbytheactiveAuxOCS,anappropriateComparatorOperationsettingisrequiredas
well.TheComparatorOperationdefinesthespecificcomparisontestmadebythealtimeter.Bycreatingcomparisons
againstthecurrentVelocityorAltitude,youcancreateafailsafepermissiveorminimum/maximumlimittestaspartofyour
AuxOCS.
Altitudeisalwaysevaluatedasthecurrent“AGLAltitude”,andisalwaysexpressedinyourAuxOCSasapositivevalue.
VelocityisthecurrentVelocityascalculatedbytheRRC3.DuringtheAscentphaseofyourflightwillalwaysbeapositive
value,butduringtheDescentphase,Velocitywillalwaysbenegativevalue.
IMPORTANT:TheAscentPhaseofaflightisaftertheLaunchDetectEventandpriortotheApogeeEvent.TheDescent
PhaseofaflightisaftertheApogeeEventandpriortotheLandingEvent.

TheComparatorOperationsaredefinedasfollows:

LCDSettingValueSettingDescription
0 Disabled‐Nocomparatoroperationisdefined
1 Alt.<=ACVx100‐CompareAGLAltitudefor<=ACVx100
2 Alt.>=ACVx100‐CompareAGLAltitudefor>=ACVx100
3 Vel.<=ACVx100‐CompareVelocityfor<=ACVx100
4 Vel.>=ACVx100‐CompareVelocityfor>=ACVx100

20

AuxiliaryComparatorValue(ACV)
JustliketheComparatorOperationsetting,whenevertheComparatorisrequiredbytheactiveAuxOCS,anappropriate
AuxiliaryComparatorValue(ACV)settingisrequiredaswell.TheACVestablishesthespecificvalueusedbythealtimeterin
theaforementionedComparatorOperation.
IMPORTANT:TheACVisalwaysexpressedasamultipleof100(i.e.asettingof5=avalueof500)
IMPORTANT:AnegativeACVisONLYAPPLICABLEtoVELOCITYcomparisons.TheACVhasanadjustmentrangeof‐10
thru999.

AuxiliaryTimerInterval
WhenevertheTimerisrequiredbytheactiveAuxOCS,anappropriateTimerIntervalsettingisrequiredaswell.This
intervalsettingestablishesthedurationoftheAuxOCSTimer.
IMPORTANT:TheTimerIntervalisalwaysexpressedintenthsofseconds(i.e.asettingof10=atimerintervalof1
second).TheTimerIntervalhasanadjustmentrangeof0through999.

AuxiliaryOutputControlValue
TheOutputControlValuedetermineshowtheAuxOutputfunctionsonceithasbeenactivatedbyasuccessfulAuxOCS
operation.Thereare3distinctfunctionsthatthissettingcanestablish:
LatchedOutput‐Onceactivated,theAuxOutputwillbemaintainedONinaLatched‐Onstateuntilasubsequentpoweroff
oftheRRC3.
One‐ShotOutput‐TheAuxOutputwillactivateone‐timewithadurationof1second.Thisoperationisidenticaltoboththe
drogueandmainoutputswhentheyactivate.

RepeatOutput‐Wheninitiallyactivated,theoutputwillbehavelikethe“One‐Shot”(onfor1second,thenoffagain),
howeveritwilldelayforaspecifiedintervaland“Repeat”itsactivationcycleagain.Itrepeatsthiscycleuntilasubsequent
poweroff.
ThefollowingtableliststheOutputControlValuesettings:
LCDSettingValueSettingDescription
0 LatchedOutput
1 One‐ShotOutput
2‐100 RepeatOutput/RepeatInterval=SettingValue‐1

AuxiliaryOutputControlExamples
ThefollowingexamplesillustratesomebasicapplicationsusingtheAuxOutputcontrols
ExternalStatusLED
YoucanwireupanexternalLED/ResistortotheAuxTerminalsoftheRRC3foravisiblestatusindicatorforpre‐launch
statusandpost‐launchdata.