GM ALDL interface

Terryk terryk at foothill.net
Sat Dec 6 03:31:03 GMT 1997


The 160 baud is not uart compatible, but the parallel port can be used to
fake it.

The 8192 is uart compatible as Mr. Fenske demonstrated.

TK

----------
> From: steve ravet <steve at imes.com>
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: GM ALDL interface
> Date: Friday, December 05, 1997 10:01 AM
> 
> Squash wrote:
> > 
> > I don't want to sound stupid, but what is this ALDL interface?  Is this
> > a monitoring system?  Please inform me a bit on this!
> > --
> > Andy Quaas
> 
> ALDL is found on GM cars.  It's a serial link that the CPU uses to
> communicate with a diagnostic computer (aka scan tool), and other
> systems in the car (dash computer, ABS computer, etc.).  There are at
> least 2 flavors of ALDL, one is aobut 160 baud and the other is 8192
> baud.  The second is a TTL level rs-232 signal, the first one is strange
> and will not connect to a serial port.  A neat project would be to use a
> PIC microcontroller to read the 160 baud stream, convert the data, and
> send it out over a regular serial port.
> 
> there is a lot of ALDL info in the archives, search for it if you are
> curious.
> 
> --
> Steve Ravet
> International Meta Systems
> http://www.imes.com
> steve at imes.com



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