int readycount=0;
String inputString="";

void serialEvent() {
  while (Serial.available()) {
    // get the new byte:
String suche="SYN";
    char inChar = (char)Serial.read();
    if( inchar == suche.charAt(readycount))
readycount++;
else
readycount=0;


 if(readycount>0)    
  inputString += inChar;
if(readycount>suche.length()-1)
{
match=true
}
}