Do you have a 50 amp connection? If so, you have:
-- 120v hot (50 amp)
-- 120v hot (50 amp)
-- neutral
-- ground
Does your panel have any 240v (220v) breakers or is it all 120v? Do you have extra slots? In either case, (assuming 50 amp service) you have the potential for 240v by installing a breaker that connects to both of your 120 legs.
If you were ever to use a 30 amp adapter you would not have 240v because the adapter connects both sides of your panel to one leg of 120v.
There are a lot of assumptions and maybes in the above... what kind of panel, are 240v breakers even available for your panel, how many amps service, how your generator is wired to your panel, etc. I would talk to an electrician if you're not super confident about it.
Bottom line: 240v is possible if you have a 50 amp service, it is impossible if you have 30 amp service, (assuming standard RV connections)
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