Table of Contents
1.0INTRODUCTION
1.1PurposeofThisDocument
1.2SummaryofOperationalCharacteristics
1.3BriefDescriptionofTheSystem
1.4Interchangeability
1.4.1General
1.4.2InterchangeabilityDesiredforthe
ARINC729ADDCS
1.4.3"GenerationInterchangeability"Considerations
1.5IntegrityandAvailability
1.6RegulatoryApproval
2.0INTERCHANGEABILITYSTANDARDS
2.1Introduction
2.2FormFactors,ConnectorsandIndexPinCoding
2.2.1AnalogDataConverter(ADDCU)
2.3Interwiring
2.4PowerCircuitry
2.4.1PrimaryACPowerInput
2.4.2PowerControlCircuitry
2.4.3TheCommonGround
2.4.4TheACCommonCold
2.5SystemFunctionsandSignalCharacteristics
2.6EnvironmentalConditions
2.7Cooling
2.8GroundingandBonding
3.0STANDARDSIGNALCHARACTERISTICS
3.1InterfaceStandards
3.1.1GeneralAccuracyandOperatingRanges
3.1.2Resolution
3.1.3SynchroStandards
3.1.4Standard"AppliedVoltage"
3.1.5"StandardGround"Signal
3.1.6PhaseReversingVoltageStandards
3.2AnalogDataInputs
3.2.1SynchroSignal
3.2.2ACVoltageRatio1(ACVR1)
3.2.3ACVoltageRatio2(ACVR2)
3.2.4LowLevelAC(LLAC)
3.2.5HighLevelAC(HLAC)
3.2.6LowLevelDC(LLDC)
3.2.7HighLevelDC(HLDC)
3.2.8DCVoltageRatio(DCVR)
3.2.9PotentiometerType1(ExternalExcitation)
3.2.10PotentiometerType2(1-10KOhms,ADDCSExcited)
3.2.11ResistanceType1(90.38Ohms,3-WireInput)
(PROBE)
3.2.12ResistanceType2(90.38Ohms2-WireInput)
(RESISTANCE)
3.2.13VariableFrequencyType1
3.2.14VeryLowLevelDC(VLLDC)
3.2.15Reluctance
3.3DiscreteDataInputs(On-OffSignals)
3.3.1SeriesDiscrete
3.3.2ShuntDiscrete(DiodeIsolated)
3.3.3IdentInputs
3.4ReferenceInputs
3.5ReferenceOutputs
3.5.1ResistanceType1(PROBE)Excitation
3.5.2StrainGaugeExcitation
3.5.3PotentiometerExcitation
3.6StandardOutputs
3.6.1ARINC429DITSOutput
3.6.2BITEOutput
4.0ANALOGANDDISCRETEDATACONVERTERSYSTEMDESIGN
4.1SystemPartitioning
4.2HardwareFunctions
4.3FirmwareFunctions
4.4ADDCUInputs
4.5OutputDataFormat
4.6Self-TestandMaintainability
4.6.1FaultIndication
4.6.2BITEStatusWord
4.6.3SignStatusMatrixBits
4.7ExcitationOutputSignals
5.0PROVISIONSFORAUTOMATICTESTEQUIPMENT
5.1General
5.2UnitIdentification
5.2.1PinAllocation
5.2.2UseofATLASLanguage
ATTACHMENTS
1-1TypicalAirborneSub-systemBlockDiagrams
1-2ADDCUConnectorPlacement
2StandardInterwiring
NotesApplicabletotheStandardInterwiring
3ADDCUConnectorInsertPinLayout
4-1EADACTypicalSignalProcessing
4-2SDACTypicalSignalProcessing
5InputConnectorPinAssignmentStandards
6GuidanceForInputIsolation
7DigitalDataOutputCharacteristics
7-1LabelCodesandSDICodeApplication
7-2DataStandardsSummary(AlldataBNR)
7-3DiscreteWordBit/DiscreteInputCorrelation
8EnvironmentalTestCategories
APPENDICES
1ChronologyAndBibliography Abstract
Describes the characteristics of an Analog and Discrete Data Converter System (ADDCS) designed for installation in commercial transport system. The ADDCS is intended to process, convert and multiplex analog and discrete signals in order to provide them in digital format described in ARINC 429.
