Owner's manual


Page66
NAV440UserManual
7430‐0131‐01Rev.F
EchoPayloadContents
Byte
et
Offs
Name Format Scaling Units Description
N‐2 echoData... U1 — — Secondtolastbyteofechodata
N‐1 echoData… U1 — — Lastbyteofechodata
InteractiveCommands
Interactivecommandsareusedtointeractivelyrequestdatafromthe440Seriesunit,andtocalibrateorresetthe
unit.
GetPacketRequest
Table18GetPacketRequest
GetPacket(‘GP’=0x4750)
Preamble PacketType Length Payload Termination
0x5555 0x4750 0x02 <GPpayload> <CRC(U2)>
Thiscommandallowstheusertopollforbothmeasurementpacketsandspecialpurposeoutputpacketsincluding
0
T
,VR,andID.
Table19GPPayload
GPPayloadContents
Byte
ffset
O
Name Format Scaling Units Description
0 requestedPacketType U2 — — Therequestedpackettype
RefertothesectionsbelowforPacketDefinitionssentinresponsetothe‘GP’command
AlgorithmResetCommand
Table20AlgorithmResetCommand
AlgorithmReset(‘AR’=0x4152)
Preamble PacketType Length Payload Termination
0x5555 0x4152 0x00 — <CRC(U2)>
ThiscommandresetsthestateestimationalgorithmwithoutreloadingfieldsfromEEPROM.Allcurrentfieldvalues
willremainineffect.Theunitwillrespondwithanalgorithmresetresponse.
AlgorithmResetResponse
Table21AlgorithmReset
AlgorithmReset(‘AR’=0x4152)