Re: How to determine which protocol to use with a VW ECU

The problem is not with Baudrate detection, the problem is when I
know which protocol the ECU is using. And how I know if the ECU uses
Fast Init or Slow Init.
Bye
Ezequiel
--- In opendiag@yahoogroups.com, "Bülent Özen" <ozenelekt@i...>
wrote:
> HI Ezequiel
>
> 0x55 is sent to you extra for Baudrate detecting ( alternating 1
and 0 ) . You must measure 1 bit period ( wait of change 1--> 0
start a timer wait of 0--> 1 stop timer ) the timer count indicates
you the bit duration of intended comm. Baudrate. you can compute it
in Bit / sec . it is your baudrate.
>
> regards
>
> Bülent
>
>
>
>
> ----- Original Message -----
> From: acetoel
> To: opendiag@yahoogroups.com
> Sent: Sunday, July 06, 2003 5:40 PM
> Subject: [opendiag] How to determine which protocol to use with
a VW ECU
>
>
> Hello,
>
> I'm making a little scanner just to get the ECU ID. How can I
know
> if the ECU I'm communication is KWP1281 or KWP2000? Slow Init or
> Fast Init? I need to just plug the connector to the scanner and
> doing everything by software, determine speed ( I do this
waiting
> for a 0x55 at 10400bps, if it's 0x85 then the speed is 9600bps,
but
> don't know what to do at other speeds ), and determine which
> protocol and if it's slow or fast init.
> Thanks very much
> Ezequiel
>
>
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Received on Mon Jul 07 15:02:14 2003