receiving a multiple-frame transmission from ECU. why 03 0a 0a?

[fabio.parodi@technoleader.it]

Hello
I am using UDSApi.SvcTransferData_2013() and UDSApi.WaitForService_2013() to receive a file from an ECU.
After the first frame, the PC answers [03 0A 0A].
The PC is able to receive an unlimited amount of consecutive frames without delay, I am wondering why BlockSize is 10 and STmin is 10.
Is it possible to change that? I would like to set STmin to 0.
Thanks and regards
Fabio

[F.Vergnaud]

Hello Fabio,

What you are seeing is the ISOTP Flow Control Frame, it holds the Block Size and the Minimum Separation Time.
These can be configured with the corresponding parameters: PCANTP_PARAMETER_BLOCK_SIZE and PCANTP_PARAMETER_SEPARATION_TIME.

[fabio.parodi@technoleader.it]

thanks. it worked.

Code: Select all

        UInt32 STmin = 0;
        Peak.Can.IsoTp.cantp_status cantpres = CanTpApi.SetValue_2016(canport, cantp_parameter.PCANTP_PARAMETER_SEPARATION_TIME, ref STmin, sizeof(UInt32));