Dell 3115cn double sided scan possible?

Helllo community,

as the technical Dell hotline is unlikely unhelpful because the support had running out, I put my question to the support and community forums:

This Dell printer was set up with a duplexer unit for printing double sided (recto/verso), but is it possible to scan double sided documents with the ADF (automated document feeder)? The mechanism looks like it is possible, but I can not find an appropiate hint in the manual or the LCD.

Thanks!