The Multiplus2/Quattro can be off in three different ways:
Switch set to centre position.
Remote link disconnected
“S” command with data=4.
Are all these equivalent?
I note that it does still respond to commands from the Mk2 interface when shut down with “S4”.
If the Master is shut down with the remote link, do the slaves shut down as well, or do they all need the remote link?
Is the VeBus/Mk2 interface active when shut down from the link or the switch?
The reason I ask: trying to design a soft-start to avoid a big spark when connecting the battery.