title: Arduino restarting when serial over USB is read
body: <p>I have a timer application running on an Arduino Uno. Occasionally an interface is connected to it through USB to read the state of the timer. For development purposes it is read through the rs-232 emulation over USB.</p>
  
  <p>The problem is that the Arduino seems to restart every time the serial reading is started on the remote side. </p>
  
  <p>There is no voltage drop on either the 5V or 3.3V rails indication a brown out or crash.</p>
  
  <p>Is this known behaviour and if so is there anything that can be done to prevent it?   </p>