7210 SAS-M CHASSIS INSTALLATION GUIDE System Overview
Issue: 07 3HE 10089 AAAA TQZZA Edition 01 21
2.4.3 Alarm Interface Port
The alarm interface port is a DB15 connector that supports a critical alarm output, a
major alarm output, and four alarm inputs. When the system detects a critical or
major issue, the CPU will cause the alarm relay to issue the alarm output and turn on
the critical or major alarm LED. If you push the alarm cutoff (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.
• Power supply failure — critical alarm is raised. When the failed power supply
is removed, the critical alarm is cleared and a major alarm is raised.
• Power source failure — critical alarm is raised and the system's status LED
turns amber in color and blinks.
• 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 issue through the
appropriate alarm output pin. Please refer to the System Basics User Guide for more
details on configuring the alarm inputs.
See Table 3 for the alarm interface port pin assignments.
Table 3 Alarm Interface Port Pin Assignments
Pin Name Function
1 CRIT_ALARM_CNTR Common contact for critical alarm relay
2 CRIT_ALARM_NO Normally open during critical alarm state
3 MJR_ALARM_NC Normally closed during major alarm state
4N/C N/C
5 ALARM_IN4_EXT_+ External alarm input 4 (external relay dry contact
closure to pin 12)
6 ALARM_IN3_EXT_+ External alarm input 3 (external relay dry contact
closure to pin 13)
7 ALARM_IN2_EXT_+ External alarm input 2 (external relay dry contact
closure to pin 14)
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