A bit of a repeat of what @awjlogan said above, but it may be useful …
The emonTx5 uses the board from the emonPi2. I think the address ‘switch’ you are referring to is the display scroll button from the emonPi2. I don’t think it’s used in the emonTx5 as the emonTx5 doesn’t have a display.
The emonTx5 design is roughly similar to the emonTx4, although the emonTx5 doesn’t have the address select DIP switch of the emonTx4. So I guess the address needs to be configured over the USB port. I wrote some notes on configuring the emonTx4 over USB which may be useful. See
N.B. the emonTx4 cofiguration can also be updated using the web tool, but I don’t know if there is a version for the emonTx5? It doesn’t seem to be mentioned in the emonTx5 docs. See …
Good luck!
EDIT - @Guff666 it seems that you may have fixed this while I was writing my reply? - that’s good.