Roland VS-1824 Owner's Manual download pdf (Page 4)

About SCSI

SCSI stands for Small Computer System Interface. It is a

data transfer standard that allows large amounts of data to

be sent and received. The VS-1824 comes prepared with a

SCSI connectors allowing you to connect external SCSI

devices such as hard disks and Zip drives. This section

describes the procedures and precautions taken when using

these devices.

Disk drives are precision devices. If they are connected or

used incorrectly, not only may they fail to operate correctly,

but the data on the disk can be lost or, in the worst case, the

disk drive itself may be damaged. Please be sure to read the

manual for your disk drive.

A disk drive being used for the first time with the VS-1824

must be initialized by the VS-1824 (Owner’s Manual p. 229).

When a disk drive is initialized, all data on that disk drive is

lost. Before using a disk drive that has been used by another

device, make sure that it is all right to erase the data.

About Connections

Up to 7 disk drives can be connected to the SCSI connector of

the VS-1824 (up to 6 disk drives can be connected to the VS-

1824CD). Use SCSI cable to connect the disk drives,

connecting as shown below. SCSI connectors are not

distinguished by input and output ends, so you may attach

either end of the cable to the devices. Devices connected in

this fashion are referred to as a SCSI chain or daisy chain.

fig.01-01

• The VS-1824 features a DB-25 type connector (female).

After checking your disk drive to see what kind of SCSI

connector it uses, connect it with the appropriate cable.

• Keep SCSI cables as short as possible, and use only

cables which have an impedance that is compatible with

the SCSI standard (110Ω +/-10%), and that are

completely shield.

• Do not allow the total length of all SCSI cables

connecting the chain of disk drives to exceed 6.5 meters

(VS-1824CD: 5.5meters).

• Do not connect or disconnect SCSI cables when the

power of any device is turned on.

About Terminators

To protect against return noise, the device at each end of a

SCSI chain must have a terminating resistance. This is

referred to as a terminator. Since the VS-1824 is one end of

the SCSI chain, its internal terminator is normally in effect.

Connect a terminator only to the last external drive in the

chain. There are two types of terminators, those that can be

switched on and off (internal) and those that are attached

using SCSI connections (externally attached). Select the

method appropriate for the disk drive you are using.

• Your disk drive may feature a terminator switch that is

normally left in the “On” position (i.e., the terminator is

usually in effect). Use this type of device as the last piece

in a daisy chain.

• Do not use double terminators. For example, don’t attach

an external terminator to a disk drive that already has

and internal terminator.

Active Terminators

If you are using an external terminator, we recommend that

you make it an active terminator. In this case, if you are using

a disk drive that allows you to turn the power to the

terminator on and off, be sure to turn this power on. For

details on attaching an active terminator, refer to the owner’s

manual for your disk drive.

Active Terminator (p. 12), Terminator Power (p. 13)

About SCSI ID Numbers

Each disk drive is distinguished by its SCSI ID number (0–7).

This means that when two or more disk drives are connected,

you must make settings so that the SCSI ID numbers of the

disk drives do not conflict (coincide). If the SCSI ID numbers

conflict, the VS-1824 will not be able to correctly recognize

the disk drives.

With the factory settings, the VS-1824 is set to SCSI ID

number 7. Moreover, it is fixed to “0” and the SCSI ID

number of the CD-RW drive built in the VS-1824CD cannot

be changed. Set the disk drives you are connected to ID

numbers other than 7 (the VS-1824CD is except 0 and 7).

VS-1824 Disk Drive1

(Zip Drive, etc)

Disk Drive2

(Zip Drive, etc)

Disk Drive7

(CD-RW Drive, etc)

1 2 3 4 5 6 7 8 9 ... 139 140

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Roland VS-1824 Owner's Manual Page 4

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