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
FE
on the alphanumeric display, sound an audible alarm (a steady tone
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 (
--
). Active error codes will then be displayed once again. See Appendix D
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
Ho
mode is disabled or the
audible alarm is muted.
Three operating status LEDs (see Figure 3–2,
1, 2, and 3) display the operating status of
the EMU and enclosure. Each LED functions independently from the other two LEDs.
Their functions are as follows:
■
The green EMU status LED
1 continually F
LASHES
steadily during normal EMU
operations. If this LED is constantly O
N
or O
FF
, the EMU has malfunctioned.
■
The green power status LED
2 turns O
N
when enclosure power is operating normally.
If this LED remains O
FF
or F
LASHES
, an enclosure fault exists.
■
The amber enclosure fault LED
3 is normally O
FF
. It turns O
N
when an enclosure
fault exists.
The remaining two LEDs (see Figure 3–2,
5 and 6) are switch-LED combinations that
illuminate under specific conditions:
■
While viewing a top-level display (
id
or
Ho
), the amber increment switch LED
5 turns
O
N
— and
Er
is displayed — upon detection of an error condition. The LED turns O
FF
only while viewing the last error in the active list, otherwise, it remains O
N
.
■
The amber group switch LED
6 turns O
N
when the horn is disabled or muted.
