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Maintaining tape drives
Issue 3.3 February 2003 141
UltraSCSI connections – The following figure shows how to connect UniPack SCSI disk
drives and tape drives to an UltraSCSI card. A 68-to-68-pin VHDCI SCSI cable connects
from the UltraSCSI PCI card on the back of the computer to the IN connector on the back
of the SCSI device that is closest to the computer. A 68-to-68 pin SCSI cable connects
from the OUT connector of that device to the IN connector of the next device. Continue this
process until all assigned devices are connected in the SCSI chain.
.
When connecting SCSI devices, the last device in the chain MUST be terminated, either
via an auto-terminated device or with a manual terminator.
When using an auto-terminated SCSI device, you do not need to connect a SCSI
terminator to the OUT connector of the last SCSI device in the chain. To verify that the last
device is auto-terminated, check the LEDs labeled Auto Term High and Auto Term Low on
the back panel of the device. In a CMS configuration, both LEDs are lit on the last device in
the SCSI chain. If a device in the SCSI chain is not the last device, neither termination LED
is lit.
When using a manually-terminated device, you must connect a SCSI terminator to the
OUT connector of the last SCSI device in the chain. When you connect the SCSI
terminator to the OUT connector, the LED on the terminator is lit.
68-to-68 pin VHDCI cable
Stack of three
external SCSI devices
Dual-channel
UltraSCSI card in PCI slot 2
IN
IN
IN
OUT
OUT
OUT
68-to-68 pin SCSI cable
Target
address
switch
Back panel of Ultra 5
scsiuni.cdr
(left)
(right)