Send diagnostic (1dh), Send, Diagnostic – Dell PowerVault TL4000 User Manual
Page 86: 1dh)
SEND
DIAGNOSTIC
(1Dh)
By
means
of
this
command
the
media
changer
can
be
requested
to
perform
a
self-test
operation
on
itself.
During
this
self-test
the
serial
communication
to
the
tape
drive
and
robotics
is
tested.
Also
any
pending
Hardware
Error
condition
is
reported
on
this
command.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(1Dh)
1
LUN
PF
(1)
Reserved
SelfT
(1)
DOfl
(0)
UOfl
(0)
2
Reserved
3
(MSB)
Parameter
List
Length
(0)
4
(LSB)
5
Control
Field
descriptions:
PF:
Page
Format.
The
value
for
this
bit
must
be
set
to
1
to
indicate
that
the
SEND
DIAGNOSTICS
parameters
conform
to
the
page
structure
as
specified
in
SCSI-2.
SelfT:
This
bit
indicates
whether
the
media
changer
should
perform
the
diagnostic
test
specified
in
the
parameter
list
or
a
standard
self-test.
The
library
only
supports
the
self-test
and
should
therefore
be
set
to
1.
DOfl:
Device
Offline.
Since
diagnostics
tests
must
be
performed
when
the
media
changer
is
online,
the
value
of
this
bit
must
be
set
to
0.
UOfl:
Unit
Offline.
Since
the
media
changer
is
a
single
logical
unit,
the
value
of
this
bit
must
be
set
to
0.
Parameter
List
Length:
The
media
changer
does
not
accept
additional
parameters
for
diagnostics
test.
Must
be
set
to
zero.
3-72
TL2000
and
TL4000
SCSI
Reference