The following example shows how to set the user defined type code.  

1. Ask the manufacturer. Usually, thermistor manufacturers publish data 
   for the Steinhart Coefficients for their thermisotr products.

For example there is a thermistor, Part No. is YSI "H"10000  
and below is the table of the Steinhart Coefficients.
than follow the Step 1.
 
Coefficient         float format        hex format
    A:          1.02949264911967E-03     3A86F00B
    B:          2.39078592663805E-04     397AB12C
    C:          1.56816365983255E-07     3428615B

2. Solve the coefficients by using three known data sets: 
   (R1, T1), (R2, T2) and (R3, T3). 

   2.1 The three known data sets can be obtained by referring to 
       the published Resistance versus Temperature data table of the thermistor. 
   2.2 Obtained by measurement if no published data table available. 
       It is recommended that 
       -40°C ≦ T1, T2, T3 ≦ 150°C and |T2 - T1| ≦ 50°C, |T3 - T2| ≦ 50°C 
       to have accurate results.  

For example the datas below may be obtained by published table or by measurement.
then follow Step 2.
  
	Resistance in ohm    Temperature in C   
	   R1: 29490			T1: 0               
	   R2: 3893				T2: 50              
	   R3: 816.8			T3: 100             

Note: If the resistance is larger than 180K ohms, 
then it is treated as under range.