Manual
The
SCSI
Interface
Chapter
3
Page
26
Connecting
Two
SCSI
Devices
In the simplest
case,
only two devices share the SCSI chain - the SCSI host and
the SCSI target device. In our
case,
the SCSI host
is
the Macintosh and the SCSI target
device
is
the scanner. This simple configuration
is
shown in Figure 3.10.
(a)
Computer - SCSI
Host-
(i
nt
ernally terminated)
SCSI Cabl
e----------
(b) Scanner -
SCSI Target
Card Slots
DB-25 DB-IS [ll]
SCSI Video
Port Port
.!} .!}
SCSI Terminator
-------~)
(
Figure
3.10
Two SCSI devices on rhe SCSI bus.
(a)
The
M
ac
intosh
is
me SCSI host.
(b)
Coolscan
is
rhe SCSI rarger d
ev
ice.
The
rear view
of
your sysrem may nor
be
me same.
Procedure (Use the SCSI cable supplied with Coolscan):
1. Make sure that the Macintosh
is
powered off.
2. Connect the DB25-pin side
of
the cable to the Macintosh's SCSI connector (on
the back
of
the Macintosh).
3. Connect the Centronics 50-pin side
of
the cable to the top SCSI connector on
the back
of
Cools can. This cable
wi
ll
connect Coolscan to the Macintosh's SCSI
bus.
4. Connect a SCSI terminator to the bottom SCSI connector
on
the back
of
Coolscan, since this
is
the end
of
the SCSI chain. Termination on Macintosh
HEx
systems requires the proper black terminator, supp
li
ed by Apple. Do not u
se
the
gray terminator supp
li
ed with Coolscan.
In this
case,
both the SCSI host side
of
the bus and the SCSI target device side
of
the bus must be terminated,
as
shown in Figure 3.10.
Nikon
Coolscan
Installation
Guide
for
Macintosh