Appendix E
In-Use
LED
Pattern List
When
the
controller
is
operating
under
the
control of a mainframe, the LED display will
indicate
what
function
the
controller
is
performing. The following list of LED
patterns
and
controller functions is included as
an
aid in troubleshooting.
LED
Pattern
00010
00100
00110
01000
01010
01100
01110
10000
10010
10100
10110
11000
11010
11100
11110
The
controller
is:
waiting for a
command
and
monitoring drive status.
sending
data
to host system.
receiving
data
from host system.
determining status
and
format from
requested
unit.
loading
heads
on
a drive.
waiting for a
secondary
HP-IB
command.
formatting a track.
waiting for a command; last
operation
completed without
error. DSJ
=
O.
waiting for a command; last operation
completed
with er-
ror. DSJ
=
l.
waiting
for
a
command;
power-on
holdoff
is
active.
DSJ = 2.
waiting for a
command;
parity
error
was
enabled
and
de-
tected
on
last
command.
DSJ = 3.
executing VERIFY command.
moving the
heads
one
track.
writing a sector.
reading a sector.
Note that
if
the
right-hand LED
is
lit, the controller
is
not operating
under
the
control of a
mainframe. Refer
to
Table
4-2
for a list of
error
codes.
E-l
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