Epson B 310N - Manual (Page 53)

Printing with Special Layout Options 53
For example, you can put “Confidential” on an important document.
Double-sided (Duplex) Printing
Two types of double-sided printing are available: standard and folded booklet.
Standard double-sided printing lets you automatically print on both sides of the page (on
plain paper only), using the duplex unit.
Without the duplex unit, you can print the odd-numbered pages first. Once these pages are
printed, you can reload them to print the even-numbered pages onto the opposite side of
the paper.