I have got it to work. I had to use the Activhub that was supplied with the Activexpressions. The firmware was the problem. On the supplied Activhub that worked the firmware was V. 5.13 Build 0
The Activhub that did not work was supplied with firmware V. 5.10 Build 0.
I will try to upgrade the old Activhub. It would really be convenient to use my old Activhub.