DNP 3.0 protocol cannot be set via front panel or ION Setup in ION7650.
The protocol cannot be set to DNP 3.0 on a com port without first setting it in the DNP Slave Options module.
Using ION Setup, open the advanced modules list (ctrl-left-click on meter). Open the DNP Slave Options module.
Open one of the three available DNP connections and click the Setup Registers tab. Double-click on the Comm Port
register and set it to the port you wish to use. Click Send.
Now the com port used above can be set to use the DNP 3.0 protocol either on the front panel or via ION
Setup (Setup Assistant -> Communications -> Serial Settings -> <port> -> Protocol).