##Background

My co-worker told me he needed to monitor UPS with SNMP module but he only can get hexadecimal digits from UPS module with SNMPWALK commands. Then I had to turn hexadecimal  to decimal. 
He gave me a passage about IEEE754: http://www.softelectro.ru/ieee754_en.html

C  12    F  15    
B  
 
11    E  14

C2 05 FB EE 

1100 0010 0000 0101 1111 1011 1110 1110

1 = negative "-"

1
1000 01000
0101 1111 1011 1110 1110

1000 0100 = 132 - 127 = 5 so 2^5 = 32

0000 1011 1111 0111 1101 110 = 392174, so 392174/2^23 = 0.0467507

fomula = - 2^5 x (1+0.0467507) = -33.4 

0101 1111 1011 1110 1110 = 392174

C205FBEE

Python Script

#!/usr/bin/env python
 

#-*- coding:utf-8 -*-
var = input("Please enter dec number:")
b = bin(int(var, 16))
print(b)
S = int(b[2])
#print(S)
e = b[3:11]
#print(e)

E = int(e, 2)
#print(E)

m = b[12:]
#print(m)
M = int(m, 2)
#print(M)

F = ((-1)**S)*(2**(E-127))*(1+M/(2**23))
print(round(F, 10))