OK, slowly making good progress with this.

I have yet to get a cable so I set it up using Bluetooth.

Oudie - Settings - Hardware = Others
Oudie - Settings - Input - Port settings, Start using serial com 4 to search for Bluetooth devices.
Oudie - Settings - Input - Bluetooth - Lookup
Once you have found the EOS, select "Pair" - Use 1234 as a pin number then select OK.
The Serial Port should automatically change to "Com5: (Bluetooth)
I set Baudrate to 38400 as this was set in the User Port in the EOS
Parity = None, Bits = 8, Stop bit = 1, Set DTR = Ticked, Set RTS = unchecked.
Select - OK in Serial Port Box - Select OK at bottom left.

This got the communication working between the EOS and the Oudie.