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8.2.3 Setting the DS-TZ89N-TA SCSI ID
The DS-TZ89N-TA has a push-button counter switch on the rear panel to
select the SCSI ID. It is preset at the factory to 15. Push the button above
the counter to increment the SCSI ID (the maximum is 15); push the button
below the switch to decrease the SCSI ID.
8.2.4 Cabling the DS-TZ89N-TA Tape Drives
You must connect the DS-TZ89N-TA tabletop model to a single-ended
segment of the shared SCSI bus. It is connected to a differential portion of
the shared SCSI bus with a DWZZB-AA. Figure 8–7 shows a configuration of
a T885 for use on a shared SCSI bus. Just replace the TZ885 in the figure
with a DS-TZ89N-TA and the DWZZA-AA with a DWZZB-AA. To configure
the shared SCSI bus for use with a DS-TZ89N-TA follow these steps:
1. You will need one DWZZB-AA for each DS-TZ89N-TA.
Ensure that the DWZZB jumpers W1 and W2 are installed to enable the
single-ended termination.
Remove the termination from the differential end by removing the five
14-pin SIP resistors.
2. Attach a trilink connector to the differential end of the DWZZB-AA.
3. Connect the DWZZB-AA single-ended end to the DS-TZ89N-TA with a
BN21K or BN21L cable.
4. Install an H879-AA terminator on the other DS-TZ89N-TA SCSI
connector.
5. Connect the trilink to the differential shared SCSI bus with BN21K
or BN21L cables. Ensure that the trilink at the end of the bus is
terminated with an H879-AA terminator.
The wide, single-ended SCSI bus may be daisy chained from one single-ended
tape drive to another with BN21K or BN21L cables as long as the SCSI bus
maximum length is not exceeded. Ensure that the tape drive on the end of
the bus is terminated with an H879-AA terminator.
You can add additional DS-TZ89N-TA tape drives to the differential shared
SCSI bus by adding additional DWZZB-AA/DS-TZ89N-TA combinations.
______________________ Note _______________________
Ensure that there is no conflict with tape drive, system, and disk
SCSI IDs.
Configuring a Shared SCSI Bus for Tape Drive Use 8–9