Adaptec AHA-3940 Installation Guide download pdf (Page 6)

Connecting SCSI Devices

Caution:

AHA-3940AUWD 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 to determine if

the device is single-ended or differential.

Connecting SCSI Cables

SCSI devices are cabled together in a single,

connected series called the

SCSI bus

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

each cable and device connector.

internal

cables, pin 1 is usually marked with a

contrasting color on one edge of the ribbon cable,

and a small triangle or number

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

orientation throughout the bus for each channel.

The AHA-3940AUWD host adapter has two

external connectors (J4 and J8) and three internal

connectors (

J1, J5,

and

), as shown in the dia-

gram on page 2. If you are connecting 8-bit SCSI

devices to channel B of an AHA-3940AUWD, you

will need 68-pin-to-50-pin converters. The follow-

ing table shows the maximum SCSI cable length

you can use for each combination of device types

and number of SCSI devices.

Device Type Number of Devices Max Cable Total

Length

SCSI-1 Up to 14 6.0m (19.7 feet)

SCSI-2 and/or SCSI-1 Up to 14 3.0m (9.8 feet)

Ultra(SCSI-3) and/or SCSI-2 Up to 4 3.0m (9.8 feet)

Ultra(SCSI-3) and/or SCSI-2 Up to 14 1.5m (4.9 feet)

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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Adaptec AHA-3940 Installation Guide Page 6

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