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ULTRA2 LVD SCSI HOST ADAPTER
Because the methods for terminating SCSI peripherals can vary widely, you should
refer to a given peripheral's documentation for instructions on how to enable or
disable its termination. Here are some general tips about device termination,
though:
• Internal Ultra2 SCSI peripherals are shipped from the factory with termination
disabled; this setting cannot be changed. Proper termination for internal
Ultra2 peripherals is always provided by a built-in connector at the end of the
attached internal Ultra2 SCSI cable.
• On other kinds of internal SCSI peripherals, termination is usually controlled
by manually setting a jumper or moving a switch on the unit, or by physically
installing or removing one or more resistor modules on the unit.
• On external SCSI peripherals of all kinds, termination is usually controlled by
installing or removing a SCSI terminator, although some peripherals have
internal termination that you can switch on or off instead.
• Most non-Ultra2 SCSI peripherals come from the factory with termination
enabled.
As it is shipped from the factory, your Ultra2 LVD SCSI Host Adapter can
automatically enable or disable its built-in termination. If the Adapter senses that it
is at the end of the bus—for example, if you attach only internal or only external
SCSI devices to it—it will auto-terminate itself. If it senses that it is in the middle of
the bus—for example, if you attach both internal and external SCSI devices to it—
it will auto-disable its terminators.
If you would rather set the Adapter's termination manually, you can go into the
SmartSCSI™ Setup Utility in the Adapter's firmware (see Section 4.6.4) and
change the "SCSI Terminators" setting in the "Adapter Setup" menu. Switch from
"Automatic" to either "ON" (always ON), "OFF" (always OFF), or a combination of
"High bit ON"/"OFF" and "Low bit ON"/"OFF":
• Set the high bit and low bit both ON if the Adapter is at the end of the bus, so
that only external devices or only internal devices are attached.
• Set the high bit and low bit both OFF if the Adapter is in the middle of the bus,
so that both internal and external devices are attached, and if at least one device
on each side (internal and external) is a Wide SCSI (68-pin, 16-bit) device.
• Set the high bit ON and the low bit OFF if the Adapter is in the middle of the
bus, so that both internal and external devices are attached, and if all of the
devices on either or both sides (internal and external) are Narrow SCSI
(50-pin, 8-bit) devices.
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