ALDL Updates was DIY-WB Output Voltage Scaling

Vim Fuego vimfuego at unite.com.au
Mon Sep 3 13:04:04 GMT 2001


> 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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