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Set the SCSI Bus Address
There may be up to eight devices (which includes the SCSI adapter) connected to a SCSI
bus. Each device must have a unique address, from 0 to 7. The bus address determines the
device’s priority on the bus. Seven is the highest priority and zero is the lowest priority.
Switches 3,2, and 1 are used to set the adapter’s address on the SCSI bus. In binary, switch
3 represents the most significant digit. When shipped from the factory, the address is set to
7 (switches 3,2, and 1 are each set to “l”, that is, in the “open” position) as shown in figure
l-4.
For most applications, “7” is the best choice for the adapter’s SCSI bus address. Table l-2
shows switch positions for other possible addresses. Be sure all devices on the bus have a
different address.
Table 1-2. SCSI Address Switch PositIons
Switch SCSI Bus 1
Address
3
2 1
0
0 0
0
0
0 1
1
0
1 0
2
0
1 1
3
1
0 0
4
1
0 1
5
1
1 0
6
1
1 1 7 (Defauh)
0 = “closed”
1 = “open”
Installing the Adapter l-9