Adaptec AHA-3940W Guía de instalación descargar pdf (Pagina 4)

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

Connecting SCSI Devices

Caution: AHA-3940/3940W host adapters

support only single-ended SCSI devices. Do

not connect differential SCSI devices, or the

host adapter may be damaged. Read the

device documentation if you are not sure

whether the device is single-ended or

differential.

Connecting Cables

SCSI devices are cabled together in a single, con-

nected series called the SCSI bus. SCSI cables must

run sequentially from one device to the next, with no

branching.

1 Lay out the cables and find the pin-1 element of

each cable and device connector.

On internal cables, pin 1 is usually marked with a

contrasting color on one edge of the ribbon cable,

and a small triangle or number 1 marks pin 1 on

the SCSI connector. External cables can only be

plugged in one way, so pin-1 orientation is

automatic.

2 Attach the SCSI cable(s) to the host adapter and

the device(s), using the internal and/or external

connector(s). Be sure to maintain correct pin-1 ori-

entation throughout the bus for each channel. You

will need 50-pin-to-68-pin converters if you are

connecting 8-bit SCSI devices to either channel of

an AHA-3940W.

On both host adapter models, SCSI Channel A

has one external and one internal connector (J1

and J4). SCSI Channel B has an internal connector

only (J2).

Terminating the SCSI Bus

The last physical SCSI device on each end of the SCSI

bus must be terminated. Termination must be dis-

abled on all other devices in the middle of the SCSI

bus. You may need to change the termination setting

on some devices in your computer system.

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Adaptec AHA-3940W Guía de instalación Pagina 4