The 120/240v outlet on a generator is wired similarly to dryer or range 4 prong outlets except in a twist lock format. On those outlets you have Line 1, Line 2, Neutral, and Ground. The voltage between L1 and L2 is 240v. L1 or L2 and Neutral is 120v.
Might have to double check but it looks like a NEMA L14-30R outlet so there should be a piniut chart online or even marked on the outlet itself.
Note the standard NEMA 5-15 outlets on the right only provide 120v.
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