My first and most important tip, read the manual!
https://aquacomputer.de/handbuecher.html…EXT_english.pdf
The connections of the D5 NEXT are labeled, so a wrong wiring is rather difficult.
You need to connect the pump to a USB header to configure it and do firmware updates if necessary, for this you need Aquasuite:
https://aquacomputer.de/software.html
For the VISION display, the same applies to USB and instructions as for the D5 NEXT, whether your problem is related to the USB, I can not say due to lack of information in your thread.
https://aquacomputer.de/handbuecher.html…ION_english.pdf
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