I have a MultiPlus-II connected to the Cerbo GX and is fully detected. The issue is that the Cerbo GX and the EG4 LL-S batteries aren’t communicating. I have the Victron to BMS cable between them (Victron Can Bus Cable | VE. Can to CAN-bus BMS type A Cable 1.8m | EG4 LL to Cerbo GX Cable - Signature Solar) and the EG4 batteries configured for the Victron communication protocol.
From my reading online it appears to be a common problem with the v2s?
I have the exact same problem:
Victron Multiplus-II connected to Cerbo GX, connected, no problem and detected and shown on the Touch50 display.
However, the GX is not communicating with the EG4 Wallmount battery. I have the BMS type A cable connected between Cerbo GX BMS-Can port and the EG4 Can port. The battery is configured for Victron communication protocol.
All firmware is up to date.
Any suggestions? Thanks - Dave
Finally got this working! I ended up using one of the VE.CAN ports on the Cerbo GX instead of the BMS-CAN port. I had to reassign the VE.CAN port from the default to “Can-Bus BMS LV (500kbps)”. Then the battery connection worked! I think the default data rate on the Cerbo GX BMS-CAN port is 250kbps and the battery is 500kbps and they both needed to be the same.
Bernie, see above for solution.
From what I know, the BMS-CAN port on a Cerbo Mk1 is always 500kbps and you can’t select anything else…
See below on my system.
My Cerbo GX is a MK2 running firmware version 3.52 and I don’t even see that "BMS-Can port " menu. Where is it located on your MK1? ie; what is the next level up?
Sorry, the above “BMS-CAN port” statement was throwing me off, believing you have Mk1. 
On Mk2 they are marked VE.Can1 and VE.Can2, from what I know, isn’t it?..
Printscreens taken from Settings → Services → BMS.Can port
My mistake! The MK2 has two VE.Can 1 ports and two VE.Can 2 ports, and NO BMS-CAN ports. So my problem was that I had not changed them from the default LYNX Ion BMS (250kbps) setting to CAN-bus BMS (500kbps).
My CERBO GX MK2 / touch50 doesn’t have the BMS menu you show. My Settings > Services menu looks like this:
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