Arduino Mega & processing, serial interface

volky Guest #3332589
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I try to use Arduino Mega for data mining from for example some 
thermometers over 24h periods. After each passed period I'll start my PC 
(Windows 7) where a processing scetch is startet to read the gathered 
data from my Arduino via serial interface (com3). But in the moment the 
serial communication starts, all my data on Arduino are erased!

In the attached sketches a simple watch replaces my thermometers.

Has anyone some ideas?
Attached files:
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Testato Guest #3585683
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normally arduino reset itself when a serial connection is established
on arduino mega PCB is there a pad named "RESET-EN"
you need to cut whit a knife the copper between the pads for remove the 
autoreset.
ATTENTION that you loose the autoreset function for program the micro, 
so the  better things is to solder a jumper on the pads and remove it 
after the upload of the program
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