Sony LIB-81 User Manual

97

Appendix

The SCSI system is composed of the following components.

• Initiator

This is the host computer system used to transfer commands. The system 
consists of the application software, the operating system, the device driver, 
the SCSI adapter card, etc.

• Bus

By connecting the SCSI cables to the SCSI adapter card, the library and other 
devices, a path (or a bus) is created for transferring commands.

• Targets

The AIT library and the AIT drive are peripheral devices (or targets) that 
receive commands from the host computer. Up to 16 devices (including the 
host computer) can be connected to the Wide SCSI bus. Also, up to 8 devices 
can be connected to the Narrow SCSI bus.

When you are setting up the AIT library using a SCSI bus, please note the 
following precautions 

The AIT library is an LVD SCSI device. All SCSI devices connected to the AIT 
library on the SCSI bus must be LVD SCSI devices.

The interface of the AIT library is Wide SCSI. In order to connect the AIT 
library to a Narrow SCSI bus, use a 50-pin to 68-pin LVD SCSI adapter. Also, 
make sure every unused data lines are terminated by an adapter.

Set a unique SCSI ID for each device on a SCSI bus. The host computer uses 
these SCSI IDs to differentiate between the devices. Also, the SCSI IDs are used 
to prioritize the order of communication when several devices are 
communicating with the host computer. 

The SCSI ID of a device has nothing to do with its physical location.

If the AIT library is the device connected to the end of the SCSI bus, you must 
attach a terminator to the unused SCSI connector to terminate the SCSI bus. The 
AIT library can supply electric power to the terminator. For information about 
details, refer to“Setting the DIP Switches” (page 18) in Chapter 2, 
“Installation”.