Adaptec 3940UW User's Guide download pdf (Page 29)

2-9

Installing the Host Adapter and SCSI Devices

AHA-3940U/3940UW/3940UWD User’s Guide

Stock Number: 511041-00, Rev. B Page: 2-9

Print Spec Number: 494569-00

Current Date: 2/14/97 ECN Date: 2/17/97

Connecting External SCSI Devices

You can daisy-chain up to seven external SCSI devices to Channel A

of the AHA-3940U. You can daisy-chain up to fifteen external SCSI

devices to Channel A of the AHA-3940UW or Channels A and B of

the AHA-3940UWD. Daisy-chaining means connecting multiple

devices with multiple cables. For example, a cable runs from the

external SCSI connector to the first external device; a second connec-

tor on the back of the external device allows another cable to connect

with the second device in the chain, and so forth.

The external SCSI cables must meet the specifications listed in Choos-

ing SCSI Cables on page 2-5. External cable connectors can only be

plugged in one way, so pin-1 orientation is automatic. You can buy

appropriate cables and other accessories from Adaptec; call

(800) 442-SCSI.

Follow these steps to connect external SCSI devices:

Attach one connector of the external SCSI cable to the external

SCSI connector, as shown in Figure 2-9.

Attach the connector at the other end of the external cable to

either one of the SCSI connectors on the external SCSI device,

External SCSI Cable

External SCSI Connector

(AHA-3940UWD has two

connectors)

Figure 2-9. External Cable to Host Adapter

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Adaptec 3940UW User's Guide Page 29