Difference between DPT 20.102 and 20.105

Hi community,

I'm trying to understand what is the relation between the DPTs that are used for controlling thermostats: DPT 20.102 and 20.105. In which case should I use one or another?

There is also the DPT 1.100 Heat/Cool which I'm not sure how to use it. For example: when mode is 'auto', is the value of Heat/Cool (1.100) taken into account? Or just on certain modes like 'comfort'?

Thanks