Re: [opendiag] Re: kwp71 commands including EPROM reading

Hi

the only difference between KW71 and KW1281 is keywords

The keyword tells which protocol is used. The keyword is read as 8 bit no parity, but is actually send as 7 bit odd parity. The two seven bit numbers( 8a ---> 0a and 8f ---> 0f 80h ---> 0 ) will give a 14 bit number asfollows:

(KW2 X 128) + KW1 = protocol number.

KW71 keywords are ---> C7h and 80h ( with parity )----> 47h and 0 ( w/o parity )

(0x00 X 128) + 0x47 = 1281 (KWP 71)

(0x0a X 128) + 0x01 = 1281 (KWP 1281)

(0x09 X 128) + 0x77 = 1271 (KWP 1271)

(0x0f X 128) + 0x50 = 2000 (KWP 2000)

B/R

Bülent

----- Original Message -----
From: Sander
To: opendiag@yahoogroups.com
Sent: Monday, September 01, 2003 1:54 PM
Subject: [opendiag] Re: kwp71 commands including EPROM reading

As far as I know, a lot of the commands for kwp1281 are the same as
for kwp71 (I (also) don't know what exactly kwp71 is). There are a
few specific ones. Of course the interpretation of the data can be
different too, for example with the data replied on the faultcode
diagnose.

Sander.

--- In opendiag@yahoogroups.com, "Ken Wilson" <wilsonkrg@o...> wrote:
> Thanks Sander,
>
> Most of us would not have realised that this was equivalent to
KWP71.
> Is there something out there similar to KWP1281 that you could
point
> us too as well please. Thanks in advance.
>
> Ken W (Aust)
>
>
>
> --- In opendiag@yahoogroups.com, "Sander" <sander.qv@z...> wrote:
> > I saw several questions on this subject and the answer is already
> in
> > this group!
> >
> > See the following file (thanks to the one who uploaded it!):
> > http://groups.yahoo.com/group/opendiag/files/Fiat/07273.pdf
> >
> > Although this is for fiat, most of the kwp71 commands are the
same
> > for every car. As can be seen in the file, the command to read
the
> > EPROM is 0x03 followed by the number of bytes and the address to
> > start.
> >
> > Bye, Sander.

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Received on Mon Sep 01 04:39:20 2003