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15 AIT Tape Library User Manual
Page 114
SCSI ID
Each device on the SCSI bus must have a unique ID. The host computer uses these IDs to identify each
device. The SCSI ID also determines which device has priority when more than one device is trying to
communicate with the host. The lower the ID, the lower the priority of the device.
NOTE
A device’s SCSI ID does not depend on physical location. For
example, the last device on a multi-device SCSI bus can have a SCSI
ID of 2.
The library can use two SCSI IDs, one for the robot and one for the tape drive. Separate IDs allow the
robot and tape drive to operate as independent devices, receiving different sets of SCSI commands from
the host.
SCSI Bus Termination
If the library is the last device on the SCSI bus, you must terminate the bus by installing a pass-through
terminator on the library’s unused SCSI connector. Or, if there is an unused connector at the end of the
SCSI cable, you can terminate the bus there. The library does not supply terminator power.
For the recommended terminator to use with the library, see Appendix A.
NOTE
Plasmon recommends using active termination. Plasmon testing has
shown that older passive termination does not provide rising edge
transitions that are fast or clean enough at fast SCSI speeds.