System Description

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SystemDescriptionandInstallationManualforRangeFinder ICD10000‐01

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8.4.2 AcknowledgeMessage:Type0x80

TheAcknowledgeMessage (ACK) issent by theRangeFinderto indicate that amessage was receivedin the

correctformatandwithvaliddata.TheRangeFinderperformsrangecheckingonallincomingdata.If anydata

isinvalidthemessageisignoredandtheRangeFinderdoes not ACK.

Thismessage:

 Issentaftereveryreceiptofavalidmessage.

 ContainsRangeFinderstatusinformation.

 Containsthecurrentaltitudebeinguse dbytheRangeFinder.

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Note:Whenadatareplyisrequired,theACKissentfirstfollowedbythedatareply.

AnoverviewoftheAcknowledgeMessageisshowninTable8 ‐30.Table8‐31providesthedetailedmessage

definition.AnexampleoftheAcknowledgeMessageis foundinTable8‐32. 

Table8‐30AcknowledgeMessagePayloadStructureOverview

PayloadIndex MessageField Numberbytes

00 ACK’dMessageType 1

01 ACK’dMessageID 1

02 SystemStateByte 1

03 PressureAltitude 3

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Table8‐31AcknowledgeMessagePayloadStructureOverview

ACK’dMessageType

ByteOffset Byte

Name

FieldDescription

00 AMT0 AMT0 ACK’dMessageType

 0x01

0x02

0x03

0x04

0x05

0x06‐0A

0x0B

0x0C

0xA0

0xB0

0x0D‐0xC1

InstallationMessage

FlightIDMessage

OperatingMessage

GPSNavigationDataMessage

DataRequestMessage

Reserved

TargetRequestMessage

Reserved

InterrogationMessage

WhisperShoutInterrogationMessage

Reserved

ACK’dMessageType

ContainstheMessageTypeofthemessagebeingacknowledged.

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

TheRangeFindercanbeconfiguredtoeither(a)usetheintegratedaltitudeencoderor(b)useanexternalaltitude

sourceattheuser’sdiscretion(Sagetechrecommendsuseoftheintegratedaltitudeencoder).TheRangeFinder

alwaysprovidesthedatafromthecurrentaltitudesourceaspartoftheACK

message.