Setting
SCSI
Addresses
Each
SCSI
device
requires
a
different
SCSI
address.
The
address
is
a
number
from
6
through
0
for
8-bit
devices,
or
from
6
through
0
and
15
through
8
for
16-bit
devices.
If
two
SCSI
devices
have
the
same
address,
your
system
will
not
function
correctly.
SCSI
address
7
is
usually
assigned
to
the
adapter,
so
additional
SCSI
devices
can
be
set
to
addresses
6
through
0
and
15
through
8.
Determining
Current
SCSI
Addresses
Manufacturers
use
many
different
methods
to
set
SCSI
addresses,
including
jumpers,
dual
inline
package
(DIP)
switches,
push
buttons,
or
dials.
If
your
SCSI
device
is
new,
check
the
documentation
that
was
provided
with
the
device
to
see
if
it
specifies
a
default
SCSI
address.
If
a
default
address
is
not
specified,
check
how
SCSI
devices
are
set,
then
check
the
device
itself
for
the
current
SCSI
address.
Be
sure
to
maintain
a
list
of
all
your
SCSI
addresses
for
future
reference
(your
system
unit
documentation
may
provide
a
table
where
you
can
record
them).
Planning
SCSI
Addresses
No
two
SCSI
devices
(on
the
same
SCSI
bus
channel)
should
have
the
same
SCSI
address.
Address
7
is
usually
assigned
to
the
adapter
(address
6
is
usually
assigned
to
a
second
adapter).
Subsystems
typically
have
fixed
SCSI
IDs
that
are
preassigned
to
each
drive
slot
on
the
bus.
The
subsystems
might
also
split
the
buses.
For
details,
see
your
subsystem
documentation.
In
subsystems
that
have
drives
shared
between
two
systems,
each
port
of
the
subsystem
is
connected
to
a
different
SCSI
adapter.
The
second
adapter’s
SCSI
address
must
not
conflict
with
that
of
any
other
device.
SCSI
address
6
is
often
used
for
the
second
adapter.
It
may
be
necessary
to
remove
a
drive
to
provide
an
address
for
the
second
adapter.
Note:
System
or
subsystem
backplane
services
may
require
an
address
of
their
own.
This
address
is
usually
ID
15.
Changing
SCSI
Addresses
To
change
SCSI
addresses,
follow
the
instructions
in
the
documentation
provided
with
each
device.
Terminating
the
SCSI
Devices
and
Adapter
Some
SCSI
devices
have
built-in
terminators
controlled
by
a
DIP
switch,
jumper,
or
push
button.
Other
devices
use
terminators
on
the
cable.
Some
devices
require
a
terminator
be
plugged
into
the
device
on
a
connector.
After
planning
your
installation,
supply
the
correct
terminator
to
the
SCSI
device
on
the
device
end
of
the
chain.
The
adapter
always
terminates
at
one
end
of
the
chain.
Refer
to
the
device
instructions
to
determine
how
it
is
terminated.
If
necessary,
purchase
terminators
when
you
buy
devices
and
cables.
For
reliable
SCSI
operation,
active
terminators
are
required
for
all
installations.
The
basic
rules
of
terminating
SCSI
buses
are
as
follows:
v
Terminate
the
ends
of
the
chain.
v
Do
not
terminate
devices
in
the
middle
of
the
chain.
Appendix
C.
Connecting
SCSI
Devices
to
the
Adapter
35
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