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[I]
Fig. 2.7
26
[a]
[b)
[e)
Multiple SCSI devices
on
the SCSI
bus
The LS-10E is shown
at
the end of the chain.
Dispositifs multiples sur
un
bus
SCSI
Le scanner LS-10E est positionne
en
fin de
chaine.
Mehrere SCSI-Gerate auf dem SCSI-Bus
Der Scanner LS-10E befindet sich
hier
am Ende
der
Kette.
Multiple SCSI devices
in
chain
Often
more
than one SCSI
target
device
will
be hooked
up to the SCSI bus. When this is true, the chain of
cables must connect each device together, even though
the devices
will
typically only communicate with the
computer. This chaining, as shown in Figure 2.7,
minimizes the
number
of cables and connectors.
[a]
Computer-SCSI master (internally terminated)
[b] SCSI cable
[c] Optional peripheral-SCSI
target
[d] Scanner-SCSI
target
[e] SCSI
terminator
[f] SCSI cable
In
the case shown in Figure 2.7, the LS-10E scanner is
installed at the end of the SCSI chain, opposite of the
computer. Since the LS-10E is at the end of the chain it
has to be terminated. Since the
computer
is at the
other
end of the chain, it also has to be terminated. No
other
SCSI
devices on the chain can be terminated in this
configuration.
It is equally possible to configure the SCSI chain with
the LS-10E in the center of the chain.
In
this case, the
SCSI
terminator
would reside on the optional peripheral,
as opposed to the LS-10E.
2-6 SeHing Up a SCSI Chain with
the LS-10E
The LS-10E scanner can easily sit in the
center
or
at the
end of a SCSI chain. The two 50-pin connectors
at
the
rear
of the LS-10E are both used
for
this purpose.
Something must always be plugged into each of these
two connectors. For the LS-10E plugged into the
center
of the SCSI chain, two SCSI cables must be plugged into
them, one going to each neighboring SCSI device.
In
the
case that the LS-10E is at the end of the SCSI chain,
then one connector
will
have a SCSI
cable
in it. This
cable
will
connect the LS-10E to the SCSI bus. The other
connector
will
have a SCSI
terminator
plugged into it
since
it
is at the end of the SCSI chain.