Adaptec AVA-2825 Instalační příručka stáhnout pdf (Strana 7)

AVA-2825 Installation Guide

Part Number: 510612-00, Rev A

Print Spec Number: 492733-00

Current Date: 6/8/94 ECN Date: 6/14/94

Terminating SCSI Devices

The last peripheral device at each end of the SCSI bus

must have a set of resistors called terminators

installed or enabled. Terminators must be removed

from, or disabled on, other devices in the middle of

the SCSI bus. The AVA-2825 and most SCSI peripher-

als have built-in terminators that can be enabled or

disabled.

Terminating the Host Adapter

Termination is enabled by default on AVA-2825 host

adapters. You must disable host adapter termination

if you attach SCSI devices to both the internal and

external SCSI connectors.

The table below lists possible SCSI device/host

adapter configurations.

AVA-2825 SCSI termination is controlled by the

SCSISelect program. If you need to disable host

adapter termination, first complete the physical

installation, then run SCSISelect and follow the direc-

tions in Configuring the Host Adapter on page 8.

Terminating Other SCSI Peripherals

1 Install/enable terminators on SCSI devices at the

ends of the SCSI bus (cable).

Check the manufacturer's documentation to

determine how to enable or disable termination

on SCSI disk drives and other SCSI peripheral

devices.

2 Remove/disable terminators on all devices in the

middle of the SCSI bus.

3 Be sure the SCSI cables are connected securely.

They may have been knocked loose if you

changed jumpers or switch settings on the

peripheral devices.

Devices Connected to Host Adapter Host Adapter Termination

Internal devices only

(host adapter at end of bus)

Enabled

External devices only

(host adapter at end of bus)

Enabled

Internal and external devices

(host adapter in middle of bus)

Disabled

1 2 3 4 5 6 7 8 9 10 11 12

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