Per,

Sorry I haven't responded until now. I'm pretty busy these days.

>Thanks for your replies.
>I have the understanding that when you set Inputlen=1
>and RThreshold=1
>Then OnComm triggers when there is 1 char or more
>in the buffer.
>The InputLen=1 means that when you
>read=THIS.Input
>You only get one and one char??? is this correct??

Yes, that is correct, you will only receive one character if Inputlen is set to 1.

So what you are doing is getting a character one at a time and checking it.

Jim