Terminating The Scsi Bus - Adaptec 2940UW User Manual

Terminating the SCSI Bus

To ensure reliable communication on the SCSI bus, terminators must
be installed (or enabled) on the devices at the physical ends of the
SCSI bus. The terminators on all devices between the physical ends
must be removed (or disabled).
Since the method for terminating a SCSI device can vary widely,
refer to the SCSI device's documentation for instructions on how to
enable or disable termination. Here are some general guidelines for
termination:
Termination on internal SCSI devices usually is controlled by
manually setting a jumper or a switch on the SCSI device, or by
physically removing or installing one or more resistor modules
on the SCSI device.
Termination on external SCSI devices usually is controlled by
installing or removing a SCSI terminator. On some external
SCSI devices, termination is controlled by setting a switch on
the back of the SCSI device.
By default, termination on the SCSI Card 2940UW Pro itself is
Automatic (the preferred method). To manually set termination
on the SCSI Card 2940UW Pro, see Configuring the SCSI Card
2940UW Pro with SCSISelect on page 13.
Most SCSI devices come from the factory with termination
enabled.
Understanding SCSI
3