Digital Equipment RW504-ZA, Service Manual

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2. Remove the terminator from the second SCSI port on the back panel of the
first Optical Library if a terminator is in place.
Plug the terminator into the second SCSI port of the second Optical Library.
The second SCSI port is the port furthest from the Drive Address Select
Switches.
3. Locate the 50-pin Champ to 50-pin Champ SCSI jumper cable shipped in the
box marked OPEN FIRST.
4. Plug one end of the SCSI jumper cable into the second SCSI port on the
first Optical Library (the port from which you removed the terminator). The
connector is keyed so that it only attaches one way. Lock the wire brackets
into the grooves on the sides of the connector.
5. Plug the other end of the SCSI jumper cable into the first SCSI port on the
back of the second Optical Library. The first SCSI port is the port nearest the
Drive Address Select Switches. Lock the wire brackets into the grooves on the
sides of the connector. If you have not already done so, place the terminator
on the second port of the second Optical Library.
Complete the installation by following the directions in Section C.3 to change the
SCSI addresses of the second Optical Library.
If the first Optical Library is not already connected to the host system, connect
the first Optical Library unit to the host by following the instructions in your host
system documentation, after SCSI IDs are changed.
C.3 Resetting Controller and Drive SCSI Addresses
If two Optical Library units are daisy-chained together such that the first
Optical Library unit is connected to one SCSI port on the host computer and the
second unit is connected to the SCSI port on the first Optical Library, the SCSI
addresses of the second unit’s controller and disk drives must be reset so that
they are different from the controller and drive addresses of the first unit.
The autochanger controller default SCSI address is 3 for the Optical Library
units. Leave the SCSI address of the autochanger controller in the first Optical
Library unit set to the current ID number, and change the address of the
controller in the second unit to an unused ID number by performing the following
steps:
1. To avoid bus conflicts, before changing defaults, first verify the IDs of all SCSI
devices connected to the host system and the autochanger and drive IDs of
the first Optical Library.
2. Shut down the host system.
3. Ensure that the Optical Library is switched on.
Connecting Multiple Optical Libraries C–3