Kaʻa OBD2 Papa Manaʻo Kūkākūkā
Nā kikoʻī
ʻO kekahi mau mea e nānā ai:
Kokoke ka mea hoʻohui OBD2 i kou huila, akā hūnā ʻia ma hope o nā uhi/panela
Hāʻawi ʻo Pin 16 i ka mana pākaukau (pinepine i ka wā e pio ai ke ahi)
Aia ka OBD2 pinout i ka protocol kamaʻilio
ʻO ka protocol maʻamau ʻo CAN (ma o ISO 15765), ʻo ia ka mea e hoʻopili pinepine ʻia nā pine 6 (CAN-H) a me 14 (CAN-L).
Ma ka papa diagnostics, OBD2, he 'protocol layer kiʻekiʻe' (e like me ka ʻōlelo).ʻO CAN kahi ala e kamaʻilio ai (e like me ke kelepona).
Ma keʻano kūikawā, ke kuhikuhi nei ka maʻamau OBD2 i ka mea hoʻohui OBD2, incl.he ʻelima mau protocols e hiki ke holo ma luna (e ʻike i lalo).Eia kekahi, mai ka makahiki 2008, ʻo CAN bus (ISO 15765) ka protocol kauoha no OBD2 i nā kaʻa āpau i kūʻai ʻia ma US.
ʻO ISO 15765 e pili ana i kahi hoʻonohonoho o nā palena i pili i ka maʻamau CAN (ʻo ia ka mea i wehewehe ʻia ma ISO 11898).E ʻōlelo paha kekahi e like me ka ISO 15765 "CAN no nā kaʻa".
Ma ke ʻano, wehewehe ʻo ISO 15765-4 i ke kino, ka pae loulou data a me nā papa pūnaewele, e ʻimi ana e hoʻohālikelike i ka interface kaʻa kaʻa CAN no nā mea hoʻāʻo waho.ʻO ISO 15765-2 ka wehewehe ʻana i ka layer transport (ISO TP) no ka hoʻouna ʻana i nā kiʻi CAN me nā uku i ʻoi aku ma mua o 8 bytes.Ua kapa ʻia kēia ʻano maʻamau i kekahi manawa ʻo Diagnostic Communication ma luna o CAN (a i ʻole DoCAN).E ʻike pū i ke kiʻi hoʻohālike 7 papa OSI.
Hiki ke hoʻohālikelike ʻia ʻo OBD2 me nā protocol papa kiʻekiʻe aʻe (e like me J1939, CANopen).
