SCSI IDs
A–3
4
SCSI ID 3 — RRD40 drive.
5
SCSI ID 4 — RRD40 drive.
6
SCSI ID 5 — Open.
7
SCSI ID 6 — SCSI-B controller.
8
SCSI ID 7 — Reserved.
Rules for Setting SCSI IDs
• You can have up to seven devices on one bus.
• Each device must have its own unique identifier.
• Two devices may only have the same identifier if they are on different
buses.
• Each SCSI bus must be terminated.
Proper operation of the SCSI bus requires that you use high-quality,
properly configured cables and connectors to connect all devices. Digital
recommends that you use only Digital-supplied cable assemblies intended
for interconnecting SCSI devices. This ensures that the impedance
characteristics, signal propagation velocity, inductance, capacitance, cross-
talk, grounding, conductor pairing, and shielding meet the requirements
for proper operation of the bus.
Digital also recommends that all units on the SCSI bus be powered from a
common ac power source. Digital does not guarantee the proper operation
of any SCSI bus that uses cable assemblies not supplied by Digital, or
that is not configured in accordance with Digital’s recommendations.
Setting SCSI Switches
Table A–2 lists the possible SCSI IDs and corresponding switch positions
for RRD40 compact disc drive expansion boxes.
