Datacom Systems J Class - Manual (Page 211)

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4. Check to see which SCSI device IDs are not used. You can use
ID numbers 0 through 6 if they are not already in use. If the de-
fault ID on your drive does not conflict with any existing drive
IDs, use that ID. If your default address conflicts with an exist-
ing drive ID, you need to assign a new SCSI device ID to your
drive. See the drive installation documentation for information
on changing the device ID.
CAUTION: Do not use SCSI device ID 7 for any device
except the system card.