ISO-9141

[xxalexx at ix.netcom.com]

> Date:          Thu, 29 Jan 1998 22:04:11 -0700
> To:            diy_efi at efi332.eng.ohio-state.edu
> From:          Land Shark <lndshrk at xmission.com>
> Subject:       ISO-9141
> Reply-to:      diy_efi at efi332.eng.ohio-state.edu

> At 10:24 PM 1/29/98 -0600, you wrote:
> 
> >ISO 9141 is just 10.4 Kb rs232 so can probably
> > connect straight to computer.
> 
>  THWACK THWACK
> 
>  (Jim thumps head into PC)
> 
>  Will everyone PLEASE go read the spec..
> 
>  ISO-9141 is not a fixed baud protocol..
> 
The byte code is 1 start bit 8 data 1 stop bit NRZ
which is same as rs232 except it is inverted.
A PC rs232 UART baud can be set to 5 b and 10.4 Kb
The rs232 interface would work except 9141 is open collector,
I was only able to drop line by 1 volt.
Alex