Diacom plus on Pentium laptops

[TBK]

Talking to a C3 with a serial port is difficult if not impossible without
essentially defeating the UART and just grabbing bits. I found using the
parallel port to be simpler. P4 is far easier.

TK
-----Original Message-----
From: steve ravet <steve at imes.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, July 28, 1998 12:59 PM
Subject: Re: Diacom plus on Pentium laptops


>mrvette wrote:
>>
>> Am I illiterate here on the latest and greatest?  I somehow thought that
UART's
>> solved that problem long ago....?    GENE
>
>You'd think so...  The problem is that Diacom has to talk to P4 ECMs,
>which is similar to RS-232 except a PC can't get exactly the right baud
>rate.  Close enough, though.  It also has to talk to C3 ECMs, which
>aren't at all like RS-232.  So even though the serial port could be used
>for P4 it wouldn't work for C3.  So the implement a software UART.
>Which is very timing dependant, and hence runs funny under windows.
>
>Ludis Langens did have a clever idea for using a serial port to talk to
>both, maybe someone should forward the idea to Diacom...
>
>--steve
>
>>
>> TWong29770 at aol.com wrote:
>> >
>> > I so far found that I can communicate with earlier ECM's.  However I
still
>> > cannot talk to a 94 GM truck PCM, or my 95 OBD1 PCM in my Corvette.  I
can
>> > talk to both PCM's while using a 486 slower computer.  Rinda tells me
it's the
>> > clock speed of the CPU's conflicting with the communication rate of the
>> > ECM/PCM's.
>> >
>> > Weird....
>> >
>> > Tom
>
>--
>Steve Ravet
>International Meta Systems
>http://www.imes.com
>steve at imes.com
>