JETWAY MBD-J-JNF9KC-1047 Technical Manual page 19

(10)COPEN1 (2-pin): Case Open Message Display function select
Pin 1-2 shorted: Case open display function enabled. In this case if you case is
removed, next time when you restart your computer a message will be displayed
onscreen to inform you of this.
AT_MODE1
1-2 Open： Normal;
COPEN1
1-2 Open： Normal
14
1-2 Short： AT_Mode Select.
1-2 Short： Case Open