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Time between bytes in ISO 9141-2 and KWP2000

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  • Time between bytes in ISO 9141-2 and KWP2000

    I am building an ECU simulator. How much time should pass between byte and byte when the ECU transmits a message?
    For example, if the request is : 0x68 0x6A 0xF1 0x01 0x0D (pid =0x0D)
    the ECU´s response is: 0x48 0x6B 0x10 0x01 0x0D 0x12

    For example, between 0x48 and 0x6B. How much time is there?


  • #2
    The bulk of your questions can be answered by reading the appropriate standards. In this case, it would be the ISO 9141-2. There are dozens of timing parameters that you need to know to build an OBD simulator, do you seriously intend to create a post and ask for each one of them? Yes, the spec is not free (it's ~$30, IIRC), but you need it to do your project. Save your lunch money, buy the document, and stop wasting bandwidth with RTFM-type questions.
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