Appendix B
Hardware Configuration
B-18
ni.com
CMOS Clear (JBT1)
JBT1 clears the CMOS. Instead of pins, this jumper has contact pads to
prevent accidental CMOS clearing. To clear the CMOS, use a metal object
such as a small screwdriver to touch both pads at the same time to short the
connection. Always remove the AC power cord from the system before
clearing the CMOS.
Note
For an ATX power supply, you must completely shut down the system, remove the
AC power cord, and then short JBT1 to clear CMOS.
Figure B-14.
CMOS Clear Jumper (JBT1)
Watchdog Enable/Disable (JWD)
Watchdog is a system monitor that can reboot the system when a software
application hangs. Close pins 1-2 on the JWD jumper to reset the system if
an application hangs. Close pins 2-3 to generate a nonmaskable interrupt
(NMI) signal for the application that hangs. Refer to Table B-26 for jumper
settings. You also must enable watchdog in the BIOS.
Figure B-15.
Watchdog Enable/Disable Jumper (JWD)
Table B-26.
Watchdog Enable/Disable Jumper Settings
Pins
Definition
1–2
Reset (default)
2–3
NMI
Open
Disabled
3
2
1
