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System Description

ManualsBrandsSagetech Avionics ManualsElectronicsMode A/C/S Transponder
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SystemDescriptionandInstallationManualforRangeFinder ICD10000‐01
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SurveillanceStatus
Byte
Offset
Byte
Name
FieldDescription
09 SS0
SS0(MSN) SurveillanceStatus
0x0
0x1
0x2
0x3
0x4‐0xF
NoConditionInformationAvailable
PermanentAlertCondition(Emergency)
TemporaryAlertCondition(ChangeinModeIdentityCodeotherthanemergencycondition)
SpecialPositionIdentification(SPI)Condition
Reserved
SS0(LSN) ReservedFlag
0x0‐0xF Reserved
SurveillanceStatus
Thisfieldreportstwosetsofdata.Themostsignificantnibbles(MSN)reportsthesurveillancestatusofthe
interrogatedtransponder.Theleastsignificantnibble(LSN)isreservedforfutureuse.
Range
ByteOffset ByteName FieldDescription
10 RA0 RA0 RA1 RangeData
11 RA1 0x00
0x00
0x0F
0x28
0x40
0xFF
0x00
0x01
0xFF
0x00
0x00
0xFF
0.00000000NM
0.00390625NM
15.99609375NM
40.00000000NM
64.00000000NM
255.99609375NM
Range
[AltitudeMSB][AltitudeLSB]:(MSBissentfirst)
Rangeissentinthefollowing16bitunsignednumberformat:dddddddddddddddd
Dataresolutionis0.0390625NM:lsb=2**‐8
Table8‐75ModeSInterrogationResponseMessagePayloadStructureExampleData
MessageField ByteValues(original) ByteMessage
Content(Hex)
StartByte AA [AA]
MessageType 0xA4–ModeSInterrogationResponse [A4]
MessageID Anarbitrarynumberbetween0and255(inclusive)thatuniquelyidentifiesthe
message.
[00]
PayloadLength [0C]
PAYLOAD
DownlinkFormat [10]
Altitude [0CB2]
Latitude [280080]
Longitude [A00080]
SurveillanceStatus [005A]
Checksum 8‐bitarithmeticsumofmessagefromStartBytetolastbyteofthePayloadData. [4A]