Scsi Termination; Checking For Disks On The Scsl-A Bus - Akai DR4vr Operator's Manual

72 Chapter
10:
Hard Disks
SCSI Termination
The
ends of a
SCSI
daisy chain
must be
terminated
correctly.
Otherwise,
data errors,
system
crashes,
etc.,
may
occur.
Termination
at
the
DR4vr
end
of the chain
is
taken care of
by
the
DR4vr. At
the other
end
of the
chain
you must
fit
a terminator.
Some
SCSI
devices
have
a
terminator
built-in.
This type of device
must always be connected
at
the
end of
the daisy chain.
Other devices
are supplied
with an
in-line type terminator
that
you must connect
to
the
unused
SCSI
connector.
The
following diagram shows
how
a
SCSI
daisy chain should be
terminated:
Internal termination
taken
care
of
by
DR4vr
il
o
oaao
ni
it—
)
^ ^
c
Terminated
The
following
diagram shows
an
example
of an
in-line terminator
connected
to a
hard
disk:
SCSI
cable
In-line
terminator
DR4vr
Hard
disk
Note:
The
terminator switch on
the
rear panel of
the
DR4vr
is
used
to
terminate
the
SCSI-B
bus,
which you can
use
if
you add an
optional IB-lllS SCSI-B hoard
to interface with
a
personal
computer.
The
terminator switch
is
not related
to the
termination
of the
SCSI-A
has.
Checking
for
Disks
on
the SCSi-A Bus
To
check
the status
of a hard disk connected
to
SCSI-A
bus:
1)
Pross
the
SUB-MENU
key.
Its
indicator will
flash.
2)
Press
the DISK
key.
The SCSI ID
of
all
hard
disks
that
have been
formatted
and
are
ready
for
recording
will appear.
A
flashing
SCSI ID
indicates that the
DR4vr
has
acknowledged
a
connected hard
disk,
but
the
disk has not yet been
formatted.
If
you have connected a hard
disk,
but
its
SCSI ID
does
not appear,
make
sure
that
all
SCSI
JDs
are set correctly,
all
SCSI
cables are connected
correctly,
and
the
hard
disk
is
powered
on.
Version 4.012/95