EV Charger can't read any 5xxx Modbus Register, 38xx work

Q&A and troubleshooting EVCS
, ,
1

My EVCS is connected to a VenusGX which perfectly works to read/write the 38xx registers using ioBroker/Modbus adapter V6.3.2.
However I am unable to read/write the 5xxx registers which offer a lot more EVCS functionality.
Tried various settings for hours, no success yet

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I tried to use the EVCS IP 192.168.178.117 directly and use ID 1, no success either

2

I did a Test using QModMaster. Same result. I can read the 38xx registers, but I cannot read any of the 5xxx registers. So it is not an ioBroker issue. Is there anybody out there - having had success to read the 5xxx registers?