Hey all, thanks for the replies.
The concat() method seems to work, now the next error comes up.
I want to use the sketch here:
But now I'm stuck with an error message telling me "class string has no memeber named "contains". This happens at the line "
if(readString.contains("L=1"))" 
It looks to me like I require an additional library, like String, but I have Version 0021 that to my knowledge should contain all the string commands.
Any advice on this... can I be more clear in some way?