Thanks kaare_t, I will head over to the SCADA section and post a query. At the moment the sites are all 'stand alone' - we don't monitor them at all. When an alarm goes off the operator on duty deals with it. I'd appreciate any advice you can offer re the setting up of the VPN tunnels - I had naively assumed that the ethernet module would be able to send the data to our office computer.
Regards,
Sally