How to access a Thermocouple signal in PC?
I suppose that I have to place a data acquisition system (something like this https://www.dataq.com/data-acquisition/thermocouple/) between the thermocouple and the PC. The problem is to find a DAQ that shows the software calls to use it in my own code. I'm seeing that the main part of the DAQs have their own closed software and don't allow to see those calls.


I have never seen a piece of PC DAQ hardware that did not provide APIs for software integration.  That is the whole point of DAQ hardware.  


  Does anyone know a DAQ that allows this? Or another method to connect the thermocouple and use the signal?


The company you linked above provides APIs for a number of programming languages for its DAQ hardware.