Thanks Mr Dirk
I want to ask more, where is the GND pin of DO?

I want to ask about the 2 pins 0V EX and 24 EX, what are the uses of these 2 pins? I found it in the documents Always use the same ground potential that supplies the connected sensors or actuators. But I can't find any GND pin in the DO of the RevPi compact Please let me know the above information T...

What C++ version is PiController currently using?
I want my application to use the same version of the core library to avoid unexpected errors

In the near future we will work with revpi-compact (collect data from sensors and control devices)
The language used is C++
I want to ask what C++ version is recommended to use