void OnEnable()
{
// print("Serial OnEnable");
// if (s_serial != null)
// print ("serial IsOpen: " + s_serial.IsOpen);
// else
// print ("no serial: ");
s_instances.Add (this);
if (EnableDebugInfos && !s_debug) {
Debug.LogWarning("Serial debug informations enabled by " + this);
s_debug = true;
}
checkOpen (9600);
}