hex conversion > strings.

Hi, I have 1 string of 12 numbers separated by a ',' "11.11,22.22,33.33" etc coming in my serial port. One number has so far been 5339, but now its changed to 533d, which causes problems, for reasons I am still trying to work out. The top numbers are all real numbers ie 0.000 or 00.00 or 000.0...