Hi
What peter said, make more sense to me. I have gone through a similar problem last year. But when analyzed, I found that some commands are using 3 bytes, some 5 and some 9 bytes. So I have to check in my code, which commands uses how many bytes. The second byte was the clue, where I had determined this, so I made a "Check" on 2nd received byte in my code.

Rauf