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[ILUG] Reverse engineering serial protocol

[ILUG] Reverse engineering serial protocol

Dale Dunlea daledunlea at commergy.com
Fri Oct 1 11:48:21 IST 2004


> See http://www.iol.ie/~ecarroll/autobaud.html
> Expands on the heuristic Christian mentioned.
> I remember writing something similar in assembler in college - fun!

Thanks. The fact that I can only generate random characters by tapping
the screen, as distinct from specific characters, may hamper this
slightly, but I should be able to puzzle something out.

> > I tried placing a software spy on the windows machine but 
> none of them 
> > seem to get in at boot time before the driver device locks the port.
> 
> Once you know the serial settings, maybe put a Linux machine 
> with twin serial ports between Windows and the touchscreen 
> and write or find something on Linux to log and forward the 
> data (avoids need to makeup a cable.).

It seems that in this new age of USB, there are not many spare serial
ports knocking about. But the company I used to work for designed a
"break-out board" specifically for spying on RS232 communications and a
former colleague of mine has very kindly agreed to let me borrow one. So
that should help greatly.

> Good luck!

Thanks. I may well need it.

Dale.





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