Acnodes FPC 5121 - Manual (Page 29)

 Left/Right The Left and Right keys allow you to select a setup screen.
 Up/Down The Up and Down keys allow you to select a setup screen or sub-screen.
+ Plus/Minus
The Plus and Minus keys allow you to change the field value of a particular
setup item.
Tab The key allows you to select setup fields.
F1 The key allows you to display the General Help screen.
F10
The key allows you to save any changes you have made and exit Setup. Press
the key to save your changes.
Esc
The key allows you to discard any changes you have made and exit the Setup.
Press the
key to exit the setup without saving your changes.
Enter
The key allows you to display or change the setup option listed for a
particular setup item. The key can also allow you to display the setup sub -
screens.