Nikon 35MM Film Scanner LS-10E - Manual (Page 24)

Fig. 2.6 Two SCSI devices on the SCSI bus
Deux dispositifs SCSI sur le bus SCSI
Zwei SCSI-Gerate auf dem SCSI-Bus
2-5 Setting Up the SCSI Chain
The SCSI chain is the electronic data and control bus
that connects two or more SCSI devices. As mentioned
at the start of this chapter, the SCSI chain can have
multiple devices on the bus. Thus, the name “chain”
implies the connection of these devices.
On any SCSI bus, there must be at least one SCSI
initiator and one SCSI target. The LS-10E scanner is
always a SCSI target device. This is the standard for
SCSI scanners. Most peripherals connected to
computers will be SCSI targets. Typically, the computer
will be the SCSI initiator.
In certain cases, there can be more than one initiator on
a bus, and in fact there are times when a computer can
be an SCSI target device. These cases are rare and are
not covered in this manual.
In each case, the SCSI ID's of each device must be
unique.
Two SCSI devices
In the simplest case, only two devices share the SCSI
chain. These are referred to as the SCSI initiator and
the SCSI target. In our case, the SCSI initiator is the
computer and the SCSI target is the scanner. This
simple configuration is shown in Figure 2.6.
[a] Computer SCSI initiator (internally terminated)
[b] Scanner SCSI target
[c] SCSI terminator
[d] SCSI cable
In this case, both the SCSI initiator side of the bus and
the SCSI target side of the bus have to be terminated,
as shown in Figure 2.6.
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