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Alarms and I2C Bus
Other monitoring schemes include audible alarms and I
2
C bus.
Audible Alarms
If any of the following components fails, the audible alarm will be triggered:
Cooling fan modules
PSU modules
Hard disk drives
Sensors or presence detection circuitries
If an alarm rings out, the administrator must read the error message on the terminal
or Management Software screen to determine what has triggered the alarm, and
then take appropriate actions to rectify the problem. The alarm can be turned off
on the front panel and the alarm beep pattern is described in
the Troubleshooting Guide included in the CD-ROM.
NOTE
When temperature exceeds a preset threshold, the controller’s charger circuits will
stop charging. You will then receive a message that reads “Thermal Shutdown/Enter
Sleep Mode.” When the temperature falls back within normal range, the super
capacitor will resume charging.
I
2
C
The operating status of PSU and cooling fan modules are collected through an I
2
C
serial bus. If either of those modules fails, the failure will be detected and you will be
notified through the same methods as in the audible alarms.
