Thanks guys !!!!!
I did as you suggested Ken, and made the Ethernet manager program an
exception for the firewall.
Ran ETM, reported IP as 192.168.0.10 as before.
Then I changed the IP in config, as Philip suggested, to 10.0.0.222.
Double clicking on the new IP went straight to a browser and logged in! I haven't been able to get to that login before....
All sorted!
So you can see that was half my trouble, the next part was to change
the serial from RS-232 to rs-485 2 wire comms....all done!
From problem to solution in just 1 hour by posting on a forum!
thanks, you terrific pair of blokes!