11
Pin (1-2) of AT_COPEN (4-pin):
ATX Mode/AT Mode Select
Pin 1&2 of AT_COPEN
→
ATX/AT Mode Select
1-2 Open: ATX Mode
Selected(Default);
;
1-2 Closed: AT Mode Selected.
.
Pin1
2
3
4
Pin1
2
4
3
*ATX Mode Selected
: Press power button to power on after power input ready;
AT Mode Selected:
Directly power on as power input ready.
Pin (3-4) of AT_COPEN (4-pin): Case Open Message Display Function Select
Pin 3&4 of AT_COPEN
→
Case Open Detection
C
A
SE
O
PE
N
2
G
N
D
4
3
Pin1
Pin (3-4) Closed
:
When Case open function pin short to GND, the Case open
function was detected. When used, needs to enter BIOS and enable
‘
Case Open
AT_COPEN
AT_COPEN
