Epson EPL-N2000 User Manual page 76

7. Now set the jumper and slide switch settings on the
LocalTalk/Serial module for the type of interface you'll be
using: RS-232C serial, current loop serial, or LocalTalk
(default) .
jumper switch
c
Caution:
Make sure both slide switches are set to the same position or the
printer will not operate correctly.
8. Position the module as shown below; then align its
connector with connector CN4 on the controller board.
Secure the module with the two screws that came with it.
4-8 Installing Options
slide switch