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A+ Server 2020A-8R User's Manual
SCSI Termination Enable/
Disable
Jumper JPA2 and JPA3 are used to
enable or disable termination for the
SCSI Channel A and B connectors, re-
spectively. The default setting for both
is open to enable termination. See the
table on right for pin defi nitions.
Note: In order for the SCSI drives to
function properly, please do not change
the default setting (enabled) set by the
manufacturer.
3rd Power Supply Fail Signal
Enable/Disable
The system can notify you in the event
of a power supply failure. This feature
assumes that three redundant power
supply units are installed in the chas-
sis. If you only have one or two power
supplies installed, you should disable
the function with the J3P header to pre-
vent false alarms. See the table on the
right for jumper settings.
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.
SCSI Term. Enable/Disable
Jumper Settings (JPA2/JPA3)
Jumper Setting
Open
Closed
3rd Power Supply Fail Signal
Jumper Settings (J3P)
Jumper Setting
Open
Closed
Jumper Settings (JWD)
Jumper Setting
Pins 1-2
Pins 2-3
Open
Note: When enabled, the user needs to
write their own application software in or-
der to disable the Watch Dog Timer.
5-20
Defi nition
Enabled
Disabled
Defi nition
Enabled
Disabled
Watch Dog
Defi nition
Reset
NMI
Disabled
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