ALDL Updates was DIY-WB Output Voltage Scaling

[Bruce]

Hmm,
I'd like to be corrected, but in the C3 ecms isn't everything time driven,
and just the newer ones have event and time?.
More coffee
Bruce




From: "Vim Fuego" <vimfuego at unite.com.au>
Subject: Re: ALDL Updates was DIY-WB Output Voltage Scaling
> > The only thing that's fixed is the baud rate (8192 baud) which means you
> > will never achieve more than 800 or so bytes per second. The mode 1
> request
> > string is 5 bytes long, so 10 requests a second accounts for 50 bytes,
or
> > 6% of the bus bandwidth.
> O.K, but the 'main' job of the ECM is to run the engine right!, so any
> serial data routines must be lower on the priority scale?, so if the motor
> is running at say 3,000RPM, how long does the ECM have to service the
serial
> data routine without having to ignore it and get back to it's primary
> function?. Surely that (as well as number of bytes transmitted) dictates
the
> update rates?.
> Vim


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