Epson Y16499100301 - Manual (Page 26)

A DIP switch is either on (up) or off (down). To change a
setting, use a hard, thin object, such as a small screwdriver.
Keyboard DIP switches
To access the DIP switches above the keyboard, you need
to open the cover shown below.
DIP switch cover
Press the raised tab back and lift up at the same time to expose
the DIP switches.
DIP switches
Setting Up Your System