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        OBD-II接口定義 OBD-II NETWORK STANDARDS

        2019-03-06 14:20:07 root 1016

        All cars and light trucks built for sale in the United States after 1996 are required to be OBD-II compliant. There are five OBD-II protocol types in use: J1850 PWMJ1850 VPWISO 9141-2ISO 14230 KWP2000, and ISO 15765 CAN.

         

         

        obd

         


        SAE J1850 PWM  (Pulse Width Modulation at 41.6 Kbps, two wire differential)

        Pin 2: BUS+ signal
        Pin 10: BUS- signal
        Active bus state: BUS+ is pulled high while BUS- is pulled low
        High signal voltage level: +5V (min/max 3.80 to 5.25)
        Low signal voltage level: 0V (min/max 0.00 to 1.20)
        Up to 12 message bytes, excluding frame delimiters
        Bit Timing;

        "1" Bit: Bus state active for 8uS (within 24uS bit period)
        "0" Bit: Bus state active for 16uS (within 24uS bit period)
        Start-Of-Frame: Bus state active for 48uS

         

         

        obd

         


        SAE J1850 VPW  (Variable Pulse Width at 10.4/41.6 Kpbs, single wire)

        Pin 2: BUS+ signal
        Idle bus level is low
        High signal voltage level: +7V (min/max 6.25 to 8.00)
        Low signal voltage level: 0V (min/max 0.00 to 1.50)
        Up to 12 message bytes, excluding frame delimiters
        Bit Timing;
        "1" Bit: Signal low for 128uS or high for 64uS
        "0" Bit: Signal low for 64uS or high for 128uS
        Start-Of-Frame: Signal high for 200uS

         

         

        obd

         


        ISO 9141-2   (Asynchronous serial communication at 10.4 Kbaud)

        Pin 7: K-line bidirectional for communication
        Pin 15: L-line (optional) unidirectional for waking up the ECU
        Idle signal levels are high
        Signals are active pull-down to 0V (0.00 to 2.40)
        High signal voltage level: +12V (min/max 9.60 to 13.5)
        Up to 12 message bytes, excluding frame delimiters
        Bit Timing;

        UART signaling at 10.4K baud, 8 data bits, no parity, 1 stop

         

         


        ISO 14230 KWP2000   (Asynchronous serial communication up to 10.4 Kbaud)

        Pin 7: K-line bidirectional for communication
        Pin 15: L-line (optional) unidirectional for waking up the ECU
        Idle signal levels are high
        Signals are active pull-down to 0V (0.00 to 2.40)
        High signal voltage level: +12V (min/max 9.60 to 13.5)
        Message may contain up to 255 bytes in the data field
        Bit Timing;

        UART signaling up to 10.4K baud, 8 data bits, no parity, 1 stop

         

         

        obd

         


        ISO 15765 CAN   (250kbit/sec or 500kbit/sec)

        Pin 6: CAN high (CANH)
        Pin 14: CAN low (CANL)
        Dominant or active bus state: CANH driven high while CANL driven low
        Recessive or idle bus state: CANH and CANL signals are not driven
        CANH signal voltage level: 3.5V (min/max 2.75 to 4.50)
        CANL signal voltage level: 1.5V (min/max 0.5 to 2.25)

         

        目前,J1850基本上已沒有什么車型使用,大部分采用后三種協議,就是我們俗稱的K線CAN線

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