Owner's manual

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Page90
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NAV440UserManual
7430‐0131‐01Rev.F
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ReadFieldsCommand
Table73ReadFields
ReadFields(‘RF’=0x5246)
Preamble PacketType Length Payload Termination
0x5555 0x5246 1+numFields*2 <RFpayload> <CRC(U2)>
Thiscommandallowstheusertoreadthedefaultpower‐upconfigurationfieldsfromtheEEPROM.NumFieldsisthe
numberoffieldstoread.The
field0,field1,etc.arethefieldIDstoread.RFmaybeusedtoreadconfigurationand
calibrationfieldsfromtheEEPROM.Ifatleastonefieldissuccessfullyread,theunitwillrespondwithareadfields
responsecontainingthefieldIDsanddatafromthesuccessfullyreadfields.
Ifanyfieldisunabletoberead,theunitwillrespondwithanerrorresponse.Notethatbothareadfieldsandan
errorresponsemaybereceivedasaresultofareadfieldscommand.
Table74ReadFieldsContents
RFPayloadContents
ByteOffset Name Format Scaling Units Description
0 numFields U1 — — Thenumberoffieldstoread
1 field0 U2 — — ThefirstfieldIDtoread
3 field1 U2 — — ThesecondfieldIDtoread
… … U2 — — MorefieldIDstoread
numFields*2‐1 Field… U2 — — ThelastfieldIDtoread
ReadFieldsResponse
Table75ReadFieldsResponse
ReadFields(‘RF’=0x5246)
Preamble PacketType Length Payload Termination
0x5555 0x5246 1+numFields*4 <RFpayload> <CRC(U2)>
Theunitwillsendthispacketinresponsetoareadfieldsrequestifthecommandhascompletedwithouterrors.
Table76ReadFieldsPayloadContents
RFPayloadContents
ByteOffset Name Format Scaling Units Description
0 numFields U1 — — Thenumberoffieldsread
1 field0 U2 — — ThefirstfieldIDread
3 field0Data U2 — — ThefirstfieldID’sdataread
5 field1 U2 — — ThesecondfieldIDread