Roland VS-1680 User Manual download pdf (Page 5)

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-1680 comes

prepared with a SCSI connectors allowing you to con-

nect external SCSI devices such as hard disks and Zip

drives. This section describes the procedures and pre-

cautions 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-

1680 must be initialized by the VS-1680 (Owner’s

Manual p. 111). 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 con-

nector of the VS-1680. Use SCSI cable to connect the

disk drives, connecting as shown below. SCSI connec-

tors 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.ap(scsi)-01(chain.eps)

●The VS-1680 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 con-

necting the chain of disk drives to exceed 6.5 meters.

●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-1680 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 con-

nections (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 termi-

nator 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 recom-

mend 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. 63)

Terminator Power (p. 65)

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-1680

will not be able to correctly recognize the disk drives.

With the factory settings, the VS-1680 is set to SCSI ID

number 7. Set the disk drives you are connected to ID

numbers other than 7.

VS-1680 Disk Drive1

(Zip Drive, etc)

Disk Drive2

(Zip Drive, etc)

Disk Drive7

(CD-R Drive, etc)

About SCSI

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Roland VS-1680 User Manual Page 5

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