IBM 4690 - Manual (Page 24)

Step 1. Planning Your SCSI Configuration
Plan what SCSI ID to give the tape drive connected to the SCSI bus adapter. Each
device on the adapter bus must have a unique ID. You cannot assign a device 7
because most SCSI bus adapters use this as their ID. Typically, assign the higher
SCSI ID numbers to those devices that are most often used or are faster than other
devices in the SCSI chain. The tape drive is preset at the factory to SCSI ID 0. Refer
to your SCSI bus adapter documentation for more information.
For most Store Controllers, you can press F1 during startup to view your Store
Controller and SCSI bus adapter configuration. Other Store Controllers can have
different procedures to view the configuration. Some SCSI adapters have utility
programs that allow you to view the SCSI configuration, or you might have to
physically inspect the installed SCSI devices to see how the IDs are set. For more
information, refer to the documentation that comes with your Store Controller or
SCSI bus adapter.
Step 2. Preparing for Installation
1. Touch the static-protective bag containing the tape drive to an unpainted metal
surface on the Store Controller for at least 2 seconds. Remove the drive from
the static-protective bag, holding the drive by the edges, and place it in a
convenient space next to your Store Controller.
2. Turn off the Store Controller and unplug the power cables from the power
outlet for the Store Controller and all attached peripherals.
Step 3. Configuring the Drive
The external SCSI model comes with the same defaults (termination disabled,
terminator power disabled, and parity enabled) as the internal SCSI model. Refer
to the instructions for the internal model, “Step 3. Configuring the Drive”, if you
have to open the external enclosure and adjust these settings.
The power switch is on the front panel of the tape drive. The following interfaces
are on the rear panel of the external drive:
v SCSI ID-selection push switch
v Two SCSI interface connectors
v Power cord connector
Follow these instructions to install the tape drive:
1. The tape drive has two SCSI cable connectors. Connect the external tape drive
to your Store Controller’s SCSI bus adapter using a 50-pin ribbon SCSI cable
(not provided) to one of the SCSI connectors on the back of the tape drive.
2. The end of a SCSI chain must be terminated to ensure the quality of the signal
throughout the SCSI chain. Use an 8-bit active or passive terminator. An active
terminator (IBM part number 32G3919 or equivalent) provides improved signal
quality. Determine if you need to terminate the tape drive:
v When the drive is the last SCSI device in the chain (or the only drive) attach
a terminator to the available SCSI connector on the back of the drive.
Connect the second SCSI connector to the SCSI bus adapter cable.
v When the drive is within the chain do not terminate the tape drive. Connect
the first SCSI connector to the cable from the previous device in the chain.
Connect the second SCSI connector to the next device in the chain.
10 TR-4 Tape Drive User’s Guide