Compaq AA-RHGWC-TE manual Setting the DS-TZ89N-TA Scsi ID, Cabling the DS-TZ89N-TA Tape Drives

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