Voyager 3000 User Guide
2-6
Switch positions 1-4 are used to set the starting ID for the first device (bay 0) on the bus.
Devices in bays 1,2 and 3 will automatically increment this ID by one in turn
5
. For example if
the device in bay 0 is set to be at SCSI ID 3 then the device in bay 1 will automatically appear
as ID 4, the device in bay 2 will appear as ID 5 and the device in bay 3 will appear as ID 6.
Since the addresses of the devices in the first backplane is set to occupy SCSI Ids 0
à
2 for
each bus, the default setting for the devices in the second backplane is set to be at a base
address of 3. As there are four switches the switch positions are arranged to allow 16 possible
Ids from 0
à
15.
Switch positions 5-8 are used to set the starting address of the fifth device on the bus (bay 4)
and in a similar manner devices in bays 6,7 and 8 will also be automatically incremented. The
default setting for the second bus is also to start at a base address of 3. Figure 2-8 shows how
to set up the SCSI IDs using switch DPS1.
5
If the starting address is at 15 then the subsequent Ids will
roll over
so that the second drive
will take SCSI ID 0, the third drive ID 1 etc.
Figure 2-7 Location of DPS1 on VRA-3002 second backplane
