Wrong temperature value XBee L/T/H


I send the light, temperature, humidity data from a XBee Sensor L/T/H with S5 pro to a connectPort X2 (python script). I get all the data but the problem is that the temperature value is wrong (I get -10°C whereas it’s around 24°C).
The value I get on ADC2 is around 0x0153 (339 in decimal) and I calculate the temperature with the following formula:
Temp_C = ( (ADC2/1023) * 1200) - 500 ) / 10

Here is the guide I used to configure my nodes:

Any help would be much appreciated.

What is the exact module and firmware you are working with?

The modules are X-Bee S5 Pro.
Product family : XBP08-DP
Firmware version : 1061

I would suggest looking at page 11 of the manual located at http://ftp1.digi.com/support/documentation/90001020_F.pdf

The VREF of 1.2V is for the Zigbee enabled products and not this one.