Supermicro 4020C-T, User Manual

Page: 53 / 102

Chapter 5: Advanced Serverboard Setup
5-21
Watch Dog Enable/Disable
JWD controls the Watch Dog function.
Watch Dog is a system monitor that
can reboot the system when a software
application hangs. Pins 1-2 will cause
WD to reset the system if an applica-
tion has frozen. Pins 2-3 will generate
a non-maskable interrupt signal for the
application that is frozen. See the table
on the right for jumper settings. Watch
Dog must also be enabled in BIOS.
Watch Dog
Jumper Settings (JWD)
Jumper Setting Defi nition
Pins 1-2 Reset
Pins 2-3 NMI
Open Disabled
Note: When enabled, the user needs to
write their own application software in or-
der to disable the Watch Dog timer.
Onboard Speaker Enable/
Disable
The JF2 header allows you to use
either an external speaker or the
internal (onboard) speaker. To use
the internal (onboard) speaker, close
pins 5 and 7 with a jumper. To use an
external speaker, connect the speaker
wires to pins 1 through 7 of JF2. See
the table on the right for settings and
the table associated with the Power
LED/Keylock/Speaker connection
(previous section) for pin defi nitions.
Onboard Speaker Enable/Disable
Pin Defi nitions (JF2)
Pins Defi nition
5 and 7 Jump for onboard speaker
1,3,5,7 Attach external speaker wires