Adaptec AHA-3940W Guía de instalación descargar pdf (Pagina 5)

Document Title: AHA-3940/3940W Installation Guide

Part Number: 510595-00, Rev. A

Print Spec Number: 492699-00

Current Date: 8/25/94 ECN Date:08/30/94

Terminating the Host Adapter

Host adapter termination is controlled by the

SCSISelect utility, if only one computer is connected

to the host adapter. Termination for both Channels A

and B is Enabled by default. You must disable host

adapter termination for SCSI Channel A if you attach

SCSI devices to both the internal and external SCSI

connectors of Channel A.

If you need to change host adapter termination, com-

plete the physical installation, then run SCSISelect as

described in Configuring the Host Adapter on page 6.

Termination in Multiple Computer Configurations

If you are setting up your SCSI bus with more than

one computer attached, you can enable your host

adapter to provide termination power even when

one computer is powered

off. To do this, place a

jumper shunt on jumper J6 if the second computer is

connected to SCSI Channel A or on jumper J5 if the

second computer is connected to SCSI Channel B.

This feature works only when one computer is

turned off, and the other computer connected to the

same SCSI bus accesses the disk drives and other

SCSI devices on the bus.

Setting SCSI IDs

You must assign a different SCSI ID to each device on

the SCSI bus connected to the AHA-3940/3940W

host adapter. See your SCSI device documentation to

learn how to determine the ID and change it.

■ ID 7 is the default SCSI ID for the host adapter on

both SCSI Channels A and B. You can change the

ID(s) in SCSISelect, if necessary. See Configuring

the Host Adapter on page 6.

■ SCSI devices connected to an AHA-3940 can have

IDs ranging from 0 to 7. SCSI devices connected

to an AHA-3940W can have IDs ranging from 0 to

15. (The host adapter itself uses one SCSI ID on

each channel.)

■ SCSI ID 0 should be used for the boot SCSI hard

disk; ID 1 should be used for a second SCSI hard

disk, if there is one.

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Adaptec AHA-3940W Guía de instalación Pagina 5

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