no! as i said 447A 0000 is in decimal 1148846080.0. if i use this int() i become 1148846080 just without the ".0". But i have wasted the hole Weekend to find out how to calculate from 447A 0000 back to 1000 and it finaly works! Its a gigantic calculation behind this but it works. So i have to go from Hex to Decimal to Binary, Split this in 3 parts and calculate the Sign, the Exponent and the Mantissa in decimal and then i can use this 3 numbers to calculate back to 1000. I try to use some different numbers and it is pricise enough for this. Now i just have to manage the serial communication and the Spliting of the hole Package into single informations so i can use them for my "KSP-control-center". THX for the help!