Hardware Description
Page 14 7210 SAS-T Installation Guide
Alarm Interface Port
The alarm interface port is a D-type 15-pin connector that supports a critical alarm output, a major
alarm output, and four alarm inputs. When your system has a critical or major alarm, the CPU will
drive the alarm relay to issue the alarm output and turn on the critical or major LED. If you push
the alarm cut off (ACO) button, the relay will be released but the LED will stay on until the alarm
is cleared.
The system signals the appropriate alarm output for the following events:
• Fan failure - Critical alarm is raised.
• On power supply failure - Critical alarm is raised. The critical alarm is cleared and a major
alarm is raised if the failed power supply is removed).
• On power source failure - Critical alarm is generated.
• Chassis temperature threshold exceeded - Major alarm is raised.
The system also supports four alarm inputs. The input voltage range is from 24V to 48V. If an
alarm input is active, the CPU will process it, output it to the CLI, and issue an SNMP trap. An
alarm input can also be configured to drive the appropriate alarm output pin. Additionally an
option is provided to power the device connected to the power alarm input pin. Please refer to the
Appendix , “Appendix C: Alarm Pin Assignments,” on page 87 for more details. Please refer the
System Basics user guide for more details on configuring the alarm inputs.
See Table 4 for the alarm interface port pinouts.
Table 4: Alarm Interface Port Pinouts
Pin Name Function
1 CRIT_ALARM_COM Common contact for Critical alarm relay.
2 CRIT_ALARM_NO Normally open contact will be connected to
the common contact during a Critical alarm
state.
3 MJR_ALARM_NC Normally closed contact will be disconnected
from the common contact during a Major
alarm state.
4 +24 VDC source 100 mA
referenced to chassis
ground
Available as a source voltage for use with
Alarm In 1-4.
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