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CAN Bus message structure?
CAN Bus message structure?

Video: CAN Bus message structure?

Video: CAN Bus message structure?
Video: CAN Protocol Frame Format | CAN Protocol Basics 2024, Kaum ib hlis
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A lus los yog Ncej muaj feem ntau ntawm tus ID (tus ID), uas sawv cev rau qhov tseem ceeb ntawm qhov lus , thiab mus txog yim cov ntaub ntawv bytes. Cov lus yog kis serially mus rau lub tsheb npav siv qhov tsis rov qab-rau-zero (NRZ) hom ntawv thiab tej zaum yuav tau txais los ntawm tag nrho cov nodes.

Yog li ntawd, tuaj yeem xa cov lus hauv npav?

Plaub qhov sib txawv hom lus , los yog thav duab (saib daim duab 2 thiab daim duab 3), uas ua tau xa mus rau a CAN tsheb npav yog cov ntaub ntawv thav duab, cov chaw taws teeb thav duab, qhov yuam kev thav duab, thiab cov ncej overload.

Lub tsheb npav puas tuaj yeem piav qhia? Lub Controller Area Network ( CAN tsheb npav ) yog lub siab qhov system , ua kom muaj kev sib txuas lus ntawm txhua qhov ntawm lub cev. Ib yam li ntawd, 'nodes' zoo li cov leeg sib txuas ntawm lub CAN tsheb npav , uas ua raws li lub hauv paus network qhov system . Nyob rau hauv lem, electronic control units (ECU) zoo li caj npab thiab txhais ceg.

Ua raws li qhov no hauv kev txiav txim siab, hom tsheb npav puas tuaj yeem ua tau?

Muaj plaub hom lus sib txawv (lossis "thav duab") ntawm lub npav CAN:

  • cov ntaub ntawv Frame,
  • Qhov Chaw Taws Teeb,
  • qhov yuam kev Frame, thiab.
  • lub Overload Frame.

Puas muaj peev xwm tsheb npav?

Feem ntau cov hluav taws xob yuav tsum nyob nruab nrab ntawm 2.0 V thiab 4.0 V. Yog hais tias nws qis dua 2.0 V los yog siab tshaj 4.0 V, nws muaj peev xwm hais tias ib los yog ntau lub nodes muaj faulty transceivers. Rau ib hluav taws xob qis dua 2.0 V thov xyuas CAN_H thiab CAN_L conductors kom txuas ntxiv mus.

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