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3–8
Model 2100 and 2200 Ultra SCSI Controller Enclosures User Guide
EMU Reset Conditions
Two general EMU operating error conditions reset the EMU. These internal error
conditions display
followed by three or five beeps), and then reset the EMU.
When the EMU returns to normal operating status, the alphanumeric display presents the
default display (
for details.
Alarm Reminder Tones
The constant sounding of an audible alarm for an unresolved error can be annoying. To
avoid this annoyance, the audible horn can either be disabled or muted. If disabled, no
future alarms will be heard. If muted, any new alarm will reactivate the audible alarm. See
Appendix D for remind tone details.
Status LEDs
The EMU has five LEDs: three that indicate EMU operating status, one that indicates the
presence of error conditions, and one that indicates when
audible alarm is muted.
Three operating status LEDs (see Figure 3–2,
the EMU and enclosure. Each LED functions independently from the other two LEDs.
Their functions are as follows:
The green EMU status LED
operations. If this LED is constantly O
The green power status LED
If this LED remains O
The amber enclosure fault LED
fault exists.
The remaining two LEDs (see Figure 3–2,
illuminate under specific conditions:
While viewing a top-level display (
O
— and
N
only while viewing the last error in the active list, otherwise, it remains O
The amber group switch LED
FE
on the alphanumeric display, sound an audible alarm (a steady tone
). Active error codes will then be displayed once again. See Appendix D
--
1
continually F
2
turns O
or F
, an enclosure fault exists.
FF
LASHES
3
is normally O
id
is displayed — upon detection of an error condition. The LED turns O
Er
6
turns O
mode is disabled or the
Ho
1
2
3
,
, and
) display the operating status of
steadily during normal EMU
LASHES
or O
, the EMU has malfunctioned.
N
FF
when enclosure power is operating normally.
N
. It turns O
FF
N
5
6
and
) are switch-LED combinations that
or
), the amber increment switch LED
Ho
when the horn is disabled or muted.
N
when an enclosure
5
turns
FF
.
N
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