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    2. OBD-II NETWORK STANDARDS

      2019-09-17 10:32:23 root 957

      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.

       

       

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      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

       

       

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      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

       

       

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      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

       

       

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      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)

      At present, J1850 basically has no models to use, most of them use the latter three protocols, which are commonly known as K-line and CAN line.


      Telephone consultation
      Company address
      Solution
      Contact information
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