Manner of Discourse

A manner of discourse is an identifiable style of speech that is suitable for a particular type of 

1. addressee
2. social setting, or
3. subject matter.

Examples (English) 
Here are some examples that illustrate distinctions in manners of discourse. The intended perlocutionary effect is the same, but the styles are different: 

1. Participants should remain seated throughout the ceremony.
2. Don’t get up.
3. Sit tight