What is the correct etiquette for a non-Catholic at Communion?

What is the correct etiquette at mass for a non-catholic (protestant) during communion? I do understand that they are not supposed to accept communion, but are they supposed to remain in the pew or approach the altar for a blessing?

Dear friend,

People who are not receiving Holy Communion should remain in the pew. I know that many go up for a blessing. But this is not actually prescribed. It’s just that when they do go up, the priest feels obliged to respond with a blessing.

Fr. Vincent Serpa, O.P.

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