User's Guide

Chapter 3 Installing External Tape Drives
Checking SCSI Termination
DDS-4/DAT 72 User’s Guide 42
Connecting to a Narrow
SCSI Connector
3
The external tape drives have an Ultra Wide SCSI interface. Obtaining a
50-to-68 pin adapter lets you connect the 68 pins on the external tape
drive to the 50 pins on the computer’s narrow SCSI bus.
1 Turn off your computer.
2 Connect the adapter to your computer’s 50-pin SCSI connector.
3 Connect the SCSI cable with the adapter to either of the two 68-pin
SCSI connectors on the back of the external tape drive (see figure 15
).
4 If desired, use the other SCSI connector on the back panel of the
external tape drive to attach another SCSI device.If the external tape
drive is the last or only device in the SCSI chain, terminate the SCSI
chain (see Checking SCSI Termination
).
Checking SCSI Termination 3
If the external tape drive is the last or only device in the SCSI chain, install
a terminating plug on the unused SCSI connector on the drive’s back
panel. This terminator typically is a small, rectangular plastic block that is
marked
SCSI Terminator. Figure 16 shows two examples of using SCSI
termination.
Note: Be sure the upper 8 data bytes of the 68-pin cable are
properly terminated.