Adaptec 2940U2W - Storage Controller U2W SCSI 80... User manual

USER’S
REFERENCE
SSCCSSII CCAARRDD22994400UU22WW

© 1997 Adaptec, Inc.
All rights reserved. Adaptec, and the
Adaptec logo are trademarks of Adaptec,
Inc. which may be registered in some
jurisdictions.
Printed in Singapore
STOCK NO.: 511795-00, Rev. A RQ 12/97

R
▼ ▼ ▼ ▼ SCSI Card 2940U2W
User’s Reference

iii
▼ ▼ ▼ ▼ Contents
Understanding SCSI 1
SCSI IDs 1
SCAM Protocol 2
Terminating the SCSI Bus 3
Troubleshooting 4
Troubleshooting Checklist 4
Troubleshooting in Windows 95 5
Common Error Messages 9
Using the SCSI Card 2940U2W and SCSI
Peripherals 10
Using SCSI Peripherals 10
Hard Disk Drives 10
Scanners 11
SCSI Peripheral Display at Bootup 12
Installing Multiple SCSI Cards 12
Connecting the LED Connector 13
Using SCSI and IDE (or EIDE) Peripherals 14
Replacing a Non-Adaptec SCSI Card with an Adaptec SCSI
Card 14
Configuring the SCSI Card 2940U2W with
SCSI
Select
15
Starting SCSISelect 16
Exiting SCSISelect 17
Using SCSISelect Settings 17
Basic Host Adapter Settings 17
Boot Device Options 18

iv
SCSI Card 2940U2W User’s Reference
SCSI Device Configuration 19
Advanced Configuration Options 20
Using SCSI Disk Utilities 22
Obtaining SCSI Cables and Adapters 23
External Cables 23
External Connector Diagrams 23
Internal Cables 24
Internal Connector Diagrams 24
Cabling Examples 25
Maximum Cable Lengths 27
❒

1
Understanding SCSI
SCSI (pronounced “scuzzy”) stands for Small Computer Systems
Interface. SCSI is an industry standard computer interface for con-
necting SCSI peripherals (such as a hard disk drive, CD-ROM drive,
or scanner) to a common SCSI bus.
A SCSI bus is an electrical pathway that consists of a SCSI adapter
card (such as the SCSI Card 2940U2W) installed in a computer and
one or more SCSI peripherals. SCSI cables are used to connect the
peripherals to the SCSI adapter card.
For the SCSI bus to function properly, SCSI IDs must be assigned to
SCSI devices (SCSI peripherals and SCSI card), and the SCSI bus
must be properly terminated.
SCSI IDs
Each peripheral attached to the SCSI Card 2940U2W, as well as the
SCSI Card 2940U2W itself, must be assigned a unique SCSI ID num-
ber from 0 to 15. A SCSI ID uniquely identifies each SCSI device on
the SCSI bus and determines priority when two or more devices are
trying to use the SCSI bus at the same time.
Refer to the peripheral’s documentation to set the SCSI ID. Here are
some general guidelines for SCSI IDs:
■For internal SCSI peripherals, the SCSI ID usually is set by con-
figuring a jumper on the peripheral.
■For external SCSI peripherals, the SCSI ID usually is set with a
switch on the back of the peripheral.

2
SCSI Card 2940U2W User’s Reference
■SCSI ID numbers don’t have to be sequential, as long as the
SCSI Card 2940U2W and each peripheral has a different num-
ber. For example, you can have an internal SCSI peripheral
with ID 0, and an external SCSI peripheral with ID 6. Gaps in
the sequence of numbers don’t matter.
■SCSI ID 7 has the highest priority on the SCSI bus. The priority
of the remaining IDs, in descending order, is 6 to 0, 15 to 8.
■The SCSI Card 2940U2W is preset to SCSI ID 7 and should not
be changed. This gives it the highest priority on the SCSI bus.
■Most internal SCSI hard disk drives come from the factory pre-
set to SCSI ID 0.
■If you have 8-bit SCSI peripherals, they must use SCSI IDs 0, 1,
2, 3, 4, 5, or 6. SCSI ID 0 is recommended for the first SCSI hard
disk drive.
■If you are booting your computer from a SCSI hard disk drive
connected to the SCSI Card 2940U2W, the Boot Target ID set-
ting in the SCSISelect utility must correspond to the SCSI ID of
the peripheral from which you are booting. By default, the
Boot Target ID is set to 0. See Boot Device Options on page 18 to
change the Boot Target ID.
■In Windows®95, you can use the Device Manager to view the
SCSI ID (and other details) assigned to each SCSI device
installed.
■If you installed Adaptec®EZ-SCSI®software, you can use the
SCSI Explorer utility to view the SCSI ID (and other details)
assigned to each SCSI device installed.
SCAM Protocol
The SCSI Card 2940U2W supports the SCSI Configured AutoMati-
cally (SCAM) protocol, which assigns SCSI IDs dynamically and
resolves SCSI ID conflicts automatically when you start the com-
puter. If your computer includes SCSI disk drives or other peripher-
als that support SCAM, you do not need to manually assign SCSI
IDs to these peripherals. To enable SCAM support, see Configuring
the SCSI Card 2940U2W with SCSISelect on page 15.

3
Understanding SCSI
Terminating the SCSI Bus
To ensure reliable communication on the SCSI bus, the ends of the
SCSI bus must be properly terminated. This is accomplished when
the peripheral at the end of each cable, or the end of the cable itself,
has a terminator installed (or enabled). The peripherals between the
ends of each cable must have its terminator removed (or disabled).
Since the method for terminating a SCSI peripheral can vary widely,
refer to the peripheral’s documentation for instructions on how to
enable or disable termination. Here are some general guidelines for
termination:
■Termination on internal SCSI peripherals usually is controlled
by manually setting a jumper or a switch on the peripheral, or
by physically removing or installing one or more resistor mod-
ules on the peripheral.
■Termination on external SCSI peripherals usually is controlled
by installing or removing a SCSI terminator. On some external
peripherals, termination is controlled by setting a switch on the
back of the drive.
■By default, termination on the SCSI Card 2940U2W itself is
automatic (the preferred method). To manually set termination
on the SCSI Card 2940U2W, see Configuring the SCSI Card
2940U2W with SCSISelect on page 15.
■Internal Ultra2 peripherals are set at the factory with termina-
tion disabled and cannot be changed. Proper termination for
internal Ultra2 peripherals is provided by the built-in termina-
tor at the end of the Ultra2 internal SCSI cable.
■Most non Ultra2 SCSI peripherals come from the factory with
termination enabled.

4
SCSI Card 2940U2W User’s Reference
Troubleshooting
Most problems can be resolved by following the recommendations
in Troubleshooting Checklist below. If you still experience problems
after following the recommendations, continue with the remainder
of this section.
Troubleshooting Checklist
Most problems with using the SCSI Card 2940U2W result from
errors in preparing and connecting peripherals on the SCSI bus. If
you have problems, check these items first.
Note:
If you have problems with a specific SCSI peripheral
when other connected SCSI peripherals are working cor-
rectly, please contact the manufacturer of the problem
peripheral for troubleshooting information.
■Are all SCSI peripherals turned on?
■Are all SCSI cables and power cables properly connected?
■Is the SCSI Card 2940U2W firmly seated and secured in the
PCI expansion slot?
■Is the PCI expansion slot PCI Rev. 2.1 or higher compliant and
does it support Bus Mastering?
■Are all SCSI peripherals and the SCSI Card 2940U2W assigned
unique SCSI IDs? (See Setting Up SCSI Peripherals on page 3.)
■Are all SCSI peripherals terminated properly? (See Setting Up
SCSI Peripherals on page 3.)
■If your computer allows you to set up configuration options
when the computer first boots up (that is, through CMOS
setup), are the following options set up as specified?
■If there is an Interrupt Type or Interrupt Line option in the
Setup program, select Int-A or Interrupt Type = A (you
may also be required to change a motherboard jumper set-
ting).
■If there is a Triggering Interrupt option, select Level.