DAGE-MTI Excel Series Manual de usuario descargar pdf (Pagina 39)

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 DocumentMT0100P.N

©XsensTechnologiesB.V. MTiandMTxUserManualandTechnicalDocumentation

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5.6 Internalclockaccuracy

TheinternalclockjitteroftheMTiandMTxislessthan25ns.

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TheinternalclockoftheMTiandMTxwhichgeneratesthesampletimingbasedonthesetsampleperiodis

accurate to ±30 ppm over the temperature operating range. In practice this means that the worst case

deviationaftera1hourlogis±0.108seconds(=3600s∙30ppm) or10samplecountsin360,000at100Hz

samplerate(±0.3μs/sample@100Hz).

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NOTE: For long logging times that require synchronization with external clocks or events, means of

synchronizationwithahigh‐precisionexternalclockshouldbeconsidered.

5.7 DefaultSerialConnectionSettings

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Setting DefaultValue

Bits/second(bps): 115200

Databits: 8

Parity: none

Stopbits: 1

(

)

Flowcontrol: none

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ThesesettingsarethesamefortheRS‐232astheRS‐422versions.Thebaudrate(bps)settingcanbechanged

bytheuser.Themaximumis921600bpsandtheminimum9600bps.PleaserefertotheMTiandMTxLow‐

levelCommunicationDocumentationfordetails.

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5.7.1 Generaldefinitionsforbinarydata

Allbinarydatacommunicationisdoneinbig‐endianformat.

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Example:

Un‐calibrated16bitsaccelerometeroutput

1275(decimal)=0x04FB(hexadecimal)

Transmissionorderofbytes=0x040xFB

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Calibratedaccelerometeroutput(float,4bytes)

9.81(decimal)=0x411CF5C3(hexadecimal)

Transmissionorderofbytes=0x410x1C0xF50xC3

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Thebit‐orderinabyteisalways:

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[MSB…LSB]Æ[bit7…bit0]



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TwostopbitsareneededfordevicesproducedearlierthanJanuary1

2008inordertoallowcorrectframe‐

timing.Onestopbitisalways

possibleinreceive‐onlymode.FordevicesproducedsinceJanuary1

2008one

stopbitcanbeusedinanymode.

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