1. Installing Optional Equipment
280 RS7000
This section explains how to connect external devices such as external hard disk drives, MO drives, or CD-ROM drives.

About SCSI

SCSI (pronounced “scuzzy”) stands for Small Computer System Interface, and is a data transmission interface standard used by personal
computers and other devices.
Since the RS7000 has a SCSI interface, you can connect and use hard disk drives, MO disk drives, CD-ROM drives, and other SCSI-
compatible devices that have a 50-pin SCSI connector. Up to 7 SCSI devices can be connected.
Most external SCSI devices have two SCSI terminals, allowing a number of devices to be “chained” together. Devices chained together
in this way can normally be connected in any order.
The last device in the chain must be “terminated”, either with a terminator unit plugged into the open SCSI connector, or by turning the
device’s internal terminator on (if available). The first device in the chain must also be terminated, but in the case of the RS7000 this is
accomplished by the terminator inside the RS7000.
Connecting external SCSI devices
IMPORTANT
IMPORTANT
•Before connecting SCSI devices, be sure to turn off the power of the RS7000 and all connected equip-
ment. If the power is on while connections are being made, the RS7000 or SCSI devices can be damaged.
•Including the RS7000, each SCSI device is distinguished by a number from 0 - 7, called the SCSI ID. If two
or more devices have the same SCSI ID number, the SCSI devices will not function correctly. When
shipped from the factory, the RS7000 is set to SCSI ID 6. Be aware that the SCSI ID number of a device
has no relation to its position in the daisy-chain.
•Don’t forget to attach a terminator to the last SCSI device in the daisy-chain.
•If an external SCSI device is not connected, it is not necessary to attach a terminator to the external SCSI
connector of the RS7000.
•Use as short a SCSI cable as possible. Using long cables can cause unreliable operation. (In general, the
total cable length should be less than 6 meters (approximately 18 feet).)
•Use good-quality SCSI cables. Poor-quality cables can cause unreliable operation.
•Some SCSI devices have only one SCSI connector. If you are using such a device, connect it at the end of
the daisy-chain.
Main Unit
External SCSI
device
External SCSI
device
External SCSI
device
indicates the terminator (or a terminator switch
turned ON). For devices not marked by this
symbol, do not attach a terminator (or, turn the
terminator off).