Owner's manual


e60
NAV440UserManual
7430‐0131‐01Rev.F
Pag
Descriptor Description Size(bytes) Comment Range
F4 FloatingPoint 4
IEEE754Single
ion
Precis
‐1*2^127to2^127
SN String N ASCII
PacketFormat
lloftheInputandOutputpackets,exceptthePingcommand,conformtothefollowingstructure:A
0x5555 <2‐bytepackettype(U2)> <payloadbyte‐length(U1)> <variablelengthpayload> <2‐byteCRC(U2)>
ThePingCommanddoesnotrequireaCRC,soa440Seriesunitcanbepingedfromaterminalemulator.ToPinga
Series440unit,typetheASCIIstring‘UUPK’.Ifproperlyconnected,the440Seriesunitwillrespondwith‘PK’.All
otherc
ommunicationswithaSeries440unitrequirethe2‐byteCRC.
NOTE:ASeries440unitwillalsorespondtoapingcommandusingthefullpacketformationwithpayload0and
correctlycalculatedCRC.Example:0x5555504B009ef4.
PacketHeader
Thepacketheaderisalwaysthebitpattern0x5555.
PacketType
Thepackettypeisalwaystwobyteslonginunsignedshortintegerformat.Mostinputandoutputpackettypescan
beinterpretedasapairofASCIIcharacters.Asasemanticaidconsiderthefollowingsinglecharacteracronyms:
Table12CharacterAcronyms
AcronymDescription
P Packet
F Fields:ReferstoFieldswhicharesettingsordatacontainedintheunit
E EEPROMReferstofactorydatastoredinEEPROM
R Read:Readsdefaultnon‐volatilefields
G Get:Ge scurrentvolatilefieldsorsettingst
W
Write: Writesdefaultnon‐volatilefields.Thesefieldsarestoredinnon‐volatilememoryand
determinetheunit’sbehavioronpowerup.Modifyingdefaultfieldstakeeffectonthenextpower
upandthereafter.
S
Set:Setscurrentvolatilefieldsorsettings.Modifyingcurrentfieldswilltakeeffectimmediatelyby
modifyinginternalRAMandarelostonapowercycle.