question

Have you adjusted the dip switches on the second unit? There is a pair of very small dip switches which sets the units address. If they are both at the same setting you may have an issue. Just adjust one dip switch to the on position on the second unit.

Ok. No I didn't do that. Didn't realise they have dipswitches on board. Thanks @Bathnm .

Unfortunately that didnt work. Reading more into these dip switches learned me that they are to determine if the distributors are #A, B, C or D. But only on the Lynx BMS, not on the shunt. On the Lynx shunt one cannot see the state of the fuses in Venus OS! How stupid is that!?

So I cut the data wires in the cable but the result is still the same. Then suddenly I had a hunch and connected the home made cable to the distributor that is working well on the original cable. All fuses red and the middle light yellow. So this cable isn't well though I measured again for continuity and shorts. Isn't that strange? I will look up a usb cable and let that be powered by the Cerbo's USB that is supposed to power the touch screen (which I don't use) and see how that goes. I will post the results.

Ok, I made this cable:

Put it in the distributor and everything is working now. So if someone wants to make a cable as well, here is your example.

Guess I'll never know why it didn't work out with the other cable. Still very dissapointing that it is not connected in a way I can see the fuses status on the Cerbo...

In the mean time I changed 2 fuses for 70V rated ones and connected the 2 not used spaces by means of a little 5A fuse. Red lights are gone now. No need for fuses off course because there is no current flowing so a little wire will do as well.