System Description
SystemDescriptionandInstallationManualforRangeFinder ICD10000‐01
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Table8‐11OperatingMessagePayloadStructureDetail
SquawkCode
ByteOffset ByteName FieldDescription
00 SQK0 ModeA“Squawk”Code–Astringof43‐bit(octal)numbers,paddedwith4leadingzeros.
Forexample,Squawk1234wouldbeformattedas:0000001010011100(0x02:0x9C)
01 SQK1
Mode/Config
ByteOffset ByteName FieldDescription
02 MOD0 Mode
TheModeconsistsofthefollowinginformation:
Bit0‐1:OperationModesetsthecurrentRangeFinderMode.
00=Standby
01=On
Bit2:PowerUpState‐‐Ifsetto1,theModeinthismessageisstoredinnon‐volatilememoryandused
onpowerup;
ifsetto0,theRangeFinderpowersupinSTBYmode.IftheRangeFinderisnotin
MaintenanceModethenthisassignmentisignoredandnotacknowledged.
Bit3:ADS‐BOutOn(1=EnableoutputofExtendedSquitters)
Bit4:ADS‐BPriority
Bit5–7:Reserved
Emergency/IdentByte
ByteOffset ByteName FieldDescription
03 EMG0 Emergency
TheEmergencyByteconsistsofthefollowinginformation:
Bits0–2:Emergency/PriorityStatus
Binary
000
001
010
011
100
101
110
111
Decimal
0
1
2
3
4
5
6
7
Emergency/PriorityStatus
NoEmergency
GeneralEmergency
Lifeguard/MedicalEmergency
MinimumFuel
NoCommunications
UnlawfulInterference
DownedAircraft
Reserved
Bit3:IDENT
IDENT(IndicationthattheIDENTbuttonhasbeenpressed.ThebitwillbesetinoutgoingADS‐Bsquittersfor18
secondsfromthelastreceiptofanoperatingmessagewiththisbitset)