[PD] Razor AHRS via comport: 4byte float?

[Peter P.]

Dear Pd-list,

I am trying to get a Razor AHRS sensor to work with Pd using its
comport external.
This sensor sends three angles (yaw, pitch, roll). Each of these
angles is said to be sent as a 4 byte (single precision) float value.

This float value arrives in Pd from comport's outlet as three values
0-255.
The byte order is little-endian.

I understand that a 4byte single precision float has a 1bit sign,
an 8bit exponent and a 23bit mantissa.

After five hours of trying I am wondering how I could convert this
number into a Pd float. 

I would be delighted to receive any pointers as I have run out of
ideas by now.

thank you so much!
P