Black Box SC122A, SC123A User Manual

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INFORMATION

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JULY 2000

SC122A
SC123A

4 x 2 SCSI Matrix Switch

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4x2 SCSI Matrix Switch

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FCC INFORMATION

FEDERAL COMMUNICATIONS COMMISSION

AND

INDUSTRY CANADA

RADIO FREQUENCY INTERFERENCE STATEMENTS

This equipment generates, uses, and can radiate radio frequency energy and if not
installed and used properly, that is, in strict accordance with the manufacturer’s
instructions, may cause interference to radio communication. It has been tested
and found to comply with the limits for a Class A computing device in accordance
with the specifications in Subpart J of Part 15 of FCC rules, which are designed to
provide reasonable protection against such interference when the equipment is
operated in a commercial environment. Operation of this equipment in a
residential area is likely to cause interference, in which case the user at his own
expense will be required to take whatever measures may be necessary to correct the
interference.

Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.

This digital apparatus does not exceed the Class A limits for radio noise emission from digital
apparatus set out in the Radio Interference Regulation of Industry Canada.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par Industrie Canada.

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4 X 2 SCSI MATRIX SWITCH

NORMAS OFICIALES MEXICANAS (NOM)

ELECTRICAL SAFETY STATEMENT

INSTRUCCIONES DE SEGURIDAD

1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de
que el aparato eléctrico sea operado.

2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.

3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.

4. Todas las instrucciones de operación y uso deben ser seguidas.

5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca
de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc..

6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que
sean recomendados por el fabricante.

7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.

8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá
a lo descrito en las instrucciones de operación. Todo otro servicio deberá ser
referido a personal de servicio calificado.

9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá,
alfombra o superficie similar puede bloquea la ventilación, no se debe colocar
en libreros o gabinetes que impidan el flujo de aire por los orificios de
ventilación.

10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.

11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del
tipo descrito en el instructivo de operación, o como se indique en el aparato.

3

NOM STATEMENT

12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización
del equipo no sea eliminada.

13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen del
aparato.

14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.

15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas
de energia.

16. El cable de corriente deberá ser desconectado del cuando el equipo no sea
usado por un largo periodo de tiempo.

17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.

18. Servicio por personal calificado deberá ser provisto cuando:

A: El cable de poder o el contacto ha sido dañado; u

B: Objectos han caído o líquido ha sido derramado dentro del aparato; o

C: El aparato ha sido expuesto a la lluvia; o

D: El aparato parece no operar normalmente o muestra un cambio en su

desempeño; o

E: El aparato ha sido tirado o su cubierta ha sido dañada.

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4 X 2 SCSI MATRIX SWITCH

TRADEMARKS USED IN THIS MANUAL

UL®is a registered trademark of Underwriters Laboratories Incorporated.

Windows

®

and Windows NT®are registered trademarks of Microsoft Corporation.

Any other trademarks mentioned in this manual are acknowledged to be the
property of the trademark owners.

5

CONTENTS

Contents

Chapter Page

1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.1 About the SCSI Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.2 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.2.1 LCD Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2.2 Front-Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3 Technical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3.1 Available SCSI Switch Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3.2 General Hardware Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3.3 Ultra2 SCSI Compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3.4 SCSI Switch Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.1 What’s Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2 AC Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.3 Switch Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.4 Power Equipment Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.5 SCSI Interface Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

4. Operator Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.1 AC Power Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2 LCD Display, Keypad, and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2.1 LCD Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.2.3 Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.3 LCD Display Control Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.4 SCSI Switch Port Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.5 SCSI Switch Default Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5. Configuration and Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.1 SCSI Cable Interface Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.2 Internal Terminator Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.3 Selecting Internal Terminator Power. . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.4 Selecting External Terminator Power . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.5 Serial Port Interface Pinout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5.6 Internal RS-232 Jumper Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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4 X 2 SCSI MATRIX SWITCH

Chapter Page

5.7 RS-232 Serial Port Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.8 ASCII Character Reference for SCSI Switch Box Selection . . . . . . . . . 32

5.9 Graphical User Interface (GUI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5.10 Connecting Multiple SCSI Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.11 Rackmount Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.11.1 Installation in Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.11.2 Rackmount Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.12 SCSI Switch Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.13 Network Control of SCSI Switch (Optional) . . . . . . . . . . . . . . . . . . . . 35

5.13.1 LAN Port Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.13.2 Cfgswitch Utility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.13.3 SetswitchTerm, Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

6. SCSI Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.1 SCSI Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.1.1 SCSI-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.1.2 SCSI-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.1.3 SCSI-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.1.4 Signal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.1.5 Common Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6.1.6 Passive Terminators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6.1.7 Active Terminators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6.2 SCSI Installation Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

6.3 SCSI Interface Signal Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

7

CHAPTER 1: Specifications

1. Specifications

SCSI Interface

Maximum Port Switching—Delay 3 ns

Maximum Signal Skew—2 ns

Internal Terminator Power—1 amp

SCSI-1, SCSI-2, & SCSI-3, SPI-2 compatible; Asynchronous and synchronous

compatible; Conforms to ANSI X3.131 and X3T9.2

Single-Ended SCSI (SE)

Maximum Data Rate (8-bit Narrow)—20 MBps

Maximum Data Rate (16-bit Wide)—40 MBps

Maximum Port Cable Length—6 meters (19.7 ft.)

Internal Terminator Impedance—100 ohms

Terminator Disconnect Capacitance—3 pF

Active Internal Bus Termination

Differential SCSI (DE)

Maximum Data Rate (8-bit Narrow)—20 MBps

Maximum Data Rate (16-bit Wide)—40 MBps

Maximum Port Cable Length—25 meters (82 ft.)

Internal Terminator Impedance—110 ohms

Terminator Disconnect Capacitance—5 pF

Passive Internal Bus Termination

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4 X 2 SCSI MATRIX SWITCH

Low-Voltage SCSI (LVD)

Maximum Data Rate (8-bit Narrow)—40 MBps

Maximum Data Rate (16-bit Wide)—80 MBps

Maximum Port Cable Length—25 meters (82 ft.)

Internal Terminator Impedance—105 ohms

Terminator Disconnect Capacitance—3 pF

Active Internal Bus Termination

Serial Interface

Baud Rate—9600 or 19,200 baud

Mode—No parity, 8 bits, 1 stop bit

Maximum Cable Length—15 meters (50 ft.)

Rear-Panel Connectors—DB9

LAN Port (Optional)

Protocol—TCP/IP

Interface—Ethernet

Data Rate—10 MBps

Rear-Panel Connector—RJ-45

Agency Approvals

UL®, CUL, FCC Class A, CE

Physical

Temperature—32 to 149° F (0 to 65°F)

Humidity—Up to 90% noncondensing

Power—105 to 240 VAC ± 10% (25 watts)

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CHAPTER 1: Specifications

Size—4.5"H x 11.3"W x 9.7"D (11.4 x 28.7 x 24.6 cm )

Weight—5.1 lb. (2.3 kg)

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4 X 2 SCSI MATRIX SWITCH

2. Introduction

2.1 About the SCSI Switch

The 4 x 2 SCSI Matrix Switch is a high-performance electronic crosspoint switch
for use with the SCSI (Small Computer System Interface) bus. It enables four
independent SCSI buses to be selected and electrically connected in any
combination via internal electronic switching circuits. The 4 x 2 SCSI Matrix
Switch eliminates the need to swap and reconfigure SCSI cables and bus
terminators when alternate system configurations are required.

In conjunction with the 4 x 2 SCSI Switch dual RS-232 serial interface, a Graphic
User Interface (GUI) allows the system administrator to remotely operate and
control SCSI port configuration and termination, report SCSI bus activity, gather
performance statistics, and set internal temperature points for alarm notification.
Standard DOS or modem software can also be used to control the switch using
simple ASCII control commands.

Up to 32 SCSI Switches can be connected together and controlled by one serial
port.

2.2 Features

• Ultra2, Ultra, and Fast SCSI compatible.

• 80 MBps throughput (LVD).

• Easy-to-use LCD panel.

• Daisy chain up to 32 switches.

• Share up to 60 SCSI peripherals.

• Supports single-ended, differential, LVD SCSI.

• Transparent electronic switching.

• Optional LAN Port.

• Does not require SCSI bus ID.

• User-installable.

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CHAPTER 2: Introduction

2.2.1 LCD P

ANEL

The 4 x 2 SCSI Matrix Switch features an easy-to-use, menu-driven LCD panel with
soft-touch MENU, ENTER, and directional keys. The LCD is lighted, which allows
for easy viewing and operation.

2.2.2 F

RONT

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ANELCONTROLS

• Set and configure SCSI ports

• Set termination

• Set switch number

• View power supply status

• View internal temperature

• Set internal temperature alarm

• Set serial port configuration

• Display SCSI bus busy status

• Display port configuration

2.3 Technical Description

2.3.1 A

VAILABLE

SCSI S

WITCHINTERFACES

The 4 x 2 SCSI Matrix Switch is available in the following configurations:

• Single-ended/LVD interface (SC122A)

• Differential interface (SC123A)

NOTE

Make sure that the SCSI Switch you’re installing is used with the
appropriate interface. Single-ended/LVD and differential SCSI devices
cannot be installed on the same switch unless a SCSI differential
converter is used.

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4 X 2 SCSI MATRIX SWITCH

2.3.2 G

ENERALHARDWAREDESCRIPTION

The 4 x 2 SCSI Matrix Switch’s rear panel identifies each of the independent SCSI
ports. SCSI ports A and B have two daisy-chained connectors per port, and SCSI
ports 1, 2, 3, and 4 have single connectors for installation of SCSI devices. You can
install the SCSI Switch at any point on the SCSI bus.

Each port has internal termination that can be turned on or off from the LCD
panel. External “termination power” for devices and terminators are provided by
internal resettable fuses.

The SCSI Switch does not require a device ID and is completely transparent to
all computers and peripherals on the SCSI bus. No additional software is needed
for installation and operation. A universal switching power supply auto ranges
input voltages between 105 VAC and 240 VAC.

2.3.3 U

LTRA

2 SCSI C

OMPATIBILITY

The SCSI Switch supports Ultra2 SCSI, 80-MBps (wide) SCSI host adapters,
computers, and peripherals in asynchronous and synchronous mode. The SCSI
Switch conforms to ANSI X3.131 and X3T9.2 specifications for single-ended
devices. Disconnect and reselect functions are fully supported to ensure complete
SCSI compatibility.

2.3.4 SCSI S

WITCHINSTALLATION

Ports A and B are fully bi-directional to ports 1, 2, 3, and 4 (see Figure 2-1). You
determine where to connect computers, host adapters, and peripherals. In
general, if daisy-chained ports are required for connection to external peripherals,
use ports A or B. See Figure 2-2 for a typical installation.

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CHAPTER 2: Installation

Figure 2-1. SCSI Matrix Switch block diagram.

Figure 2-2. Typical installation.

Computer

Tape

Disk

Term

Computer

Term

Term

Term

Disk

CD-Rom

Term

Scanner

Term

Scanner

Term

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2

4

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B

B

A

A

Term

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B

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Term

Term

Term

Term

Term

SCSI Switch Ports

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Term

Term

Term

Term

Term

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4 X 2 SCSI MATRIX SWITCH

NOTE

1. Connections can be made to either connector on the appropriate port.

2. “Term” indicates where terminators should be installed.

The LCD panel is used to select port connections and enable or disable each
internal SCSI port terminator. Refer to Chapter 4 for complete instructions on
operating the LCD keypad.

You can selectively enable or disable any internal terminator to meet system
configurations and requirements.

NOTE

For proper operation of any SCSI bus, there must not be a “hanging”
line or cable. Termination should be enabled on active SCSI ports that
are not connected through to another port.