conversion from hex to float

[UnderPalms]

I still try to read some temperatures which in particular give some "invalid position in decode" errors when I simply adress them by their datapoint as per definition in the csv-file. Therefore I take known and working datapoints as reference.
For example for hwc Ntc2Sensor:

• ebusctl read -c hwc Ntc2Sensor gives "35.06;OK" (so, it's 35.06 degrees Celsius)
• the corresponding hex-value by calling "ebusctl hex -s 31 0ab509030d0100" provides "03300200" as output.

Still I don't understand how the conversion from hex to a decimal number works. I tried a lot considering IEEE754 half precision by utilizing 2 of the bytes. But never I get the desired decimal value.

Surely, the first byte is the amount of usable bytes, which are for the above mentioned example: 30 02 00

How to calculate the decimal number from the hex output?