question

You can use a powered USB hub. Although, the MultiPlus should be able to provide 240mA total, but maybe a powered hub would help.

As for the communications dropout, there are quite a few different parts to make up the link to the ET112, so it could be USB or it could be the radio link or maybe there is another external factor causing the problem. Maybe radio interference?

The MultiPlus would not change the baud settings, this would be useless, they will remain fixed.

I assume this is a MultiPlus-II GX?

What USB hub is being used and how often is the problem being experienced?

We had have very hard time with MP2-GX and USB hubs but we're slowly getting it resolved without yet working out exactly why. We're hoping - in collaboration with the team at Victron - to work out why.

We've tested about 6 different kinds of hubs, both powered and unpowered.

In the meantime, these are stable for us:

https://www.techinn.com/en/digitus-slim-spider-usb-hub/137831753/p - Unpowered

https://za.rs-online.com/web/p/usb-hubs/1385535/ - Powered

Hi wkirby, thanks a lot fo feedback. Is there any sugested distance between radio module's antenna and Multiplus2, by the way I will change coax cable to increase distance between inverter and antenna.

Hello, one update from my installation.

Today I used teh Carlo Gavazzi Software with a laptop, I could get a link to the ET112., data was Tx an Rx all the time, the USB Hub and the position of the radio module was unchanged.

After plugging back to Multiplus 2 GX it failed to connect to ET112 (which can be seen at the LED of the radio module, which indicates *only Tx* but no Rx)

So I think this is not the radio module itself, also it isn't the USB Hub either EMI coming from the Multiplus into the radio module via USB cable or the firmware in the Multiplus.

I moved the radio module during plugged to Laptop direct on top of the Multiplus and the communication link was still working. So it seems not to be direct radiation from the Multiplus itself.

Any Idea what kind of test could I do to find out the root source? May be adding some ferrites to the USB line?

I have no Idea :-(

Update:

the problem was related to the ET112 address = 1, which also was the address of the EM24. After changing the adress to = 2 it took some time and it worked.

So I learned one thing:

address missmatch does not lead to a immediate lack of data, it can happed that the system seem to be working properly even after reset or rescan for system somponents. Be carefully with addresses :-D