Compaq AA-RHGWC-TE - Manual (Page 260)

You can reconfigure the tape drives and robotics controller to place multiple
tape drives on the same SCSI bus with SCSI bus jumper (part number
6210567) included with the tape library.
______________________ Note _______________________
We recommend placing no more than two TZ89 drives on a SCSI
bus segment. We also recommend that storage be placed on
shared SCSI buses that do not have tape drives.
To reconfigure TL895 SCSI bus configuration, follow these steps:
1. Remove the SCSI bus cable from one drive to be daisy chained.
2. Remove the terminator from the other drive to be daisy chained.
3. Ensure that the drive that will be the last drive on the SCSI bus has a
terminator installed.
4. Install a SCSI bus jumper cable (part number 6210567) on the open
connectors of the two drives to be daisy chained.
Figure 8–14 shows an example of a TL895 that has tape drives 1, 3, and 5
daisy chained to tape drives 2, 4, and 6 respectively.
8–46 Configuring a Shared SCSI Bus for Tape Drive Use