Before going on, please check if you have original DS18B20 sensors. I had some counterfeits with the strangest behaviour. Same vanished after some time. Sometimes after a few minutes, sometimes after a few hours, whereas other counterfeits connected at the same time at the same one-wire bus still worked.
I see that you have the waterproof DS18B20. I've never ...
The Pi's logic (GPIO) outputs are 3V3.
You will not be able to drive the DM860T directly from the Pi's GPIO as the DM860T needs a minimum logic level of 4V.
To use the Pi with the DM860T you would need to add additional components to the Pi, e.g. transistors.