SCSI ID setting. Yamaha CBX-D5

16 16 Chapter 5 : Connecting Hard Disk Drives

SCSI ID setting

The SCSI bus is a parallel type connection, and data on the bus is available to all devices.

However, communication will usually be between two devices only, so each device is allocated an ID number, like an address number. In this way, only the device with the ID number that is specified in the data will actually read and respond to the data.

If two devices share the same ID number, the system will probably crash, so make sure that each device has its own ID number. SCSI devices usually have a DIP switch or, like the

CBX-D5, a thumb wheel switch for ID setting. Refer to the instructions supplied with your particular SCSI device.

ID No. 1 ID No. 2 ID No. 3

SCSI

HARD

DISK 1

SCSI

HARD

DISK 2

SCSI

CBX-D5

SCSI

ID No. 6

SCSI

DEVICE

This device is terminated

SCSI

ID No. 5

SCSI

DEVICE

SCSI

ID No. 4

HARD

DISK 3

The Apple Macintosh example above shows six devices connected in a SCSI daisy chain

(seven including the computer). Each device has its own ID number. Note that the last device in the chain is terminated. On a Apple Macintosh computer, SCSI ID 7 is reserved for use by the computer, and ID 0 for the internal hard disk. Do not use either of these

IDs for any other SCSI device.

ATARI

ST/STE

19-pin

DSUB

SCSI

Adaptor

SCSI

ID No. 0

HARD

DISK 1

SCSI

ID No. 1

HARD

DISK 2

SCSI

ID No. 6

CBX-D5

SCSI

ID No. 3

HARD

DISK 4

SCSI

ID No. 2

HARD

DISK 3

This device is terminated

In the Atari ST/STE system shown above, five SCSI devices are connected in a daisy chain. Hard disks must be set with continuous SCSI IDs starting from 0 (0, 1, 2, 3…).

However, the CBX-D5 can be set to SCSI ID 5 or 6. Do not set any device to SCSI ID 7.

ATARI

TT

SCSI

ID No. 1

HARD

DISK 1

SCSI

ID No. 2

HARD

DISK 1

SCSI

ID No. 3

HARD

DISK 2

SCSI

ID No. 6

CBX-D5

SCSI

ID No. 5

HARD

DISK 4

SCSI

ID No. 4

HARD

DISK 3

(internal hard disk set to SCSI ID 0)

This device is terminated

In the Atari TT system shown above, six SCSI devices are connected in a daisy chain. Hard disks must be set with continuous SCSI IDs starting from 1 (1, 2, 3, 4…). However, the

CBX-D5 can be set to SCSI ID 5 or 6. Do not set any device to SCSI ID 7.