Adaptec 3940AUW Installation Guide download pdf (Page 6)

AHA-3940AU/AUW Installation Guide

Part Number: 511418-00, Rev. A

Print Spec Number: 496346-00

Current Date: 3/12/97 ECN Date:3/10/97

Connecting SCSI Devices

Caution:

AHA-3940AU/AUW host adapters

support only single-ended SCSI devices. Do

not connect differential SCSI devices, because

they may damage the host adapter. Read the

SCSI 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,

connected series called the SCSI bus. SCSI cables

must run sequentially from one device to the next,

with no branching.

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.

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. If

you are connecting 8-bit SCSI devices to

Channel A of an AHA-3940AUW, you may use

the internal 50-pin connector. If you must connect

8-bit SCSI devices to Channel B you will need

68-pin-to-50-pin converters. Refer to the User’s

Guide for detailed information or Adaptec’s

homepage under Cables.

On the AHA-3940AU host adapter, SCSI Channel

A has one internal 50-pin connector J1. Channel B

has one external J2 and one internal 50-pin con-

nector J6. The AHA-3940AUW Channel A has

one internal 68-pin connector J1, one internal

50-pin connector J4. Channel B has one internal

68-pin J2 and one external 68-pin connector J5.

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Adaptec 3940AUW Installation Guide Page 6

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