Black Box 2 x 2 SCSI Matrix Switch SC121A User Manual
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Black Box 2 x 2 SCSI Matrix Switch SC121A User Manual

Black Box 2 x 2 SCSI Matrix Switch SC121A User Manual

2 x 2 scsi matrix switch
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AUGUST 2002
SC120A-R2
SC121A
2 x 2 SCSI Matrix Switch
CUSTOMER
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
SUPPORT
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
INFORMATION
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com

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Summary of Contents for Black Box 2 x 2 SCSI Matrix Switch SC121A

  • Page 1 Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) SUPPORT FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 INFORMATION Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 FCC/IC RFI STATEMENTS, EU DECLARATION OF CONFORMITY 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.
  • Page 3 2 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.
  • Page 4 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.
  • Page 5 2 X 2 SCSI MATRIX SWITCH TRADEMARKS USED IN THIS MANUAL BLACK BOX and the logo are registered trademarks of Black Box Corporation. Microsoft, Windows, and Windows NT are registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.

  • Page 6: Table Of Contents

    TABLE OF 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.

  • Page 7: Chapter Page

    6.1.3 SCSI-3 ....................38 6.1.4 Signal Wiring ..................38 6.1.5 Common Problems ................39 6.1.6 Passive Terminators ................39 6.1.7 Active Terminators................39 6.2 SCSI Installation Tips ..................39 6.3 SCSI Interface Signal Descriptions ..............40 7. Troubleshooting....................50 7.1 Calling Black Box ..................50 7.2 Shipping and Packaging ................50...

  • Page 8: Specifications

    CHAPTER 1: Specifications 1. Specifications SCSI Interface Maximum Port Switching Delay: 3 ns Maximum Signal Skew: 2 ns Internal Terminator Power: 1 amp Rear-Panel Connectors: 68-pin high-density SCSI-1, SCSI-2, and SCSI-3 (also Ultra160 SCSI [“Ultra3 SCSI”] for SC120A-R2), SPI-2 compatible; asynchronous and synchronous compatible; conforms to ANSI X3.131 and X3T9.2 Single-Ended (SE) SCSI (SC120A-R2 Only) Maximum Data Rate (8-bit Narrow): 20 MBps...
  • Page 9 2 X 2 SCSI MATRIX SWITCH Low-Voltage Differential (LVD) SCSI (SC120A-R2 Only) Maximum Data Rate (8-bit Narrow): 40 MBps for Ultra2 SCSI (narrow transfers aren’t officially supported in the Ultra160 SCSI standard) Maximum Data Rate (16-bit Wide): 160 MBps Maximum Port Cable Length: 25 meters (82 ft.) Internal Terminator Impedance: 105 ohms Terminator Disconnect Capacitance: 3 pF Active Internal Bus Termination...
  • Page 10 CHAPTER 1: Specifications Physical Temperature: 32 F to 149°F (0 to 65°C) Humidity: Up to 90% relative humidity, noncondensing Power: 95 to 260 VAC ± 10% (25 watts) 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.

  • Page 11: Introduction

    2 X 2 SCSI MATRIX SWITCH 2. Introduction 2.1 About the SCSI Switch The 2 x 2 SCSI Matrix Switch is a high-performance electronic crosspoint switch for use with the SCSI (Small Computer System Interface) bus. This product enables two independent SCSI buses to be selected and electrically connected in any combination via internal electronic switching circuits.

  • Page 12: Lcd Panel

    CHAPTER 2: Introduction 2.2.1 LCD P ANEL The 2 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 ANEL ONTROLS...

  • Page 13: General Hardware Description

    2 X 2 SCSI MATRIX SWITCH 2.3.2 G ENERAL ARDWARE ESCRIPTION The 2 x 2 SCSI Matrix Switch’s rear panel identifies each of the independent SCSI ports. SCSI ports A and B have two daisychained connectors per port and SCSI ports 1 and 2 have single connectors for installation of SCSI devices.
  • Page 14 CHAPTER 2: Introduction SCSI Switch Ports Figure 2-1. SC121A block diagram. Figure 2-2. SC120A-R2 block diagram.
  • Page 15 2 X 2 SCSI MATRIX SWITCH SCSI Switch (SC120A-R2) Figure 2-3. Typical switch installation.

  • Page 16: Installation

    • (1) SCSI Matrix Switch control software CD-ROM • This users’ manual If anything is missing or damaged, call Black Box at 724-746-5500. 3.2 AC Line Voltage You can connect the SCSI Switch to any AC input voltage between 95 and 260 volts.

  • Page 17: Scsi Interface Cabling

    2 X 2 SCSI MATRIX SWITCH 3.5 SCSI Interface Cabling Both versions of the 2 x 2 SCSI Matrix Switch have 68-pin high-density connectors. Single-ended devices can have cable lengths up to 20 ft. (6 m). Differential or low- voltage differential (LVD) devices can be connected with up to 82 ft. (25 m) of cable.

  • Page 18: Operator Controls And Indicators

    CHAPTER 4: Operator Controls and Indicators 4. Operator Controls and Indicators 4.1 AC Power Switch The AC power switch is located on the SCSI Switch’s rear panel. Move it to the “|” position to turn on the switch. NOTE Always turn on the SCSI Switch before powering SCSI devices and computers.

  • Page 19: Keypad

    2 X 2 SCSI MATRIX SWITCH 4.2.2 K EYPAD Use the keypad to select menu and setup parameters for the SCSI Switch. • MENU: Returns to the SCSI Switch setup and configuration menu. • ENTER: Selects the highlighted setup parameter. •...
  • Page 20 CHAPTER 4: Operator Controls and Indicators DISPLAY PORTS DISPLAY PORTS | A 1 | A 2 | | B 1 | B 2 | SET SERIAL PORTS SET SERIAL PORTS COM 1 9600 * 19200 COM 2 9600 * 19200 DAISYCHAIN SET SWITCH NUMBER SET SWITCH NUMBER...
  • Page 21 FRONT PANEL UNLOCKED ENTER PASSWORD TO LOCK 0 0 0 0 DISPLAY VERSION BLACK BOX SC121A S/N 2 1 0 0 3 0 3 H V D V E R 2 1 1 2 1 2 4 L A N In the DISPLAY VERSION panel: •...

  • Page 22: Scsi Switch Port Configuration

    CHAPTER 4: Operator Controls and Indicators 4.4 SCSI Switch Port Configuration The SCSI Switch has an internal memory device that retains the current configuration and setup information. Switch port, termination, serial port, and control parameters are saved as they are entered on the front panel. 4.5 SCSI Switch Default Configuration The SCSI Switch default configuration as shipped from the factory is defined below.

  • Page 23: Configuration And Operation

    SCSI computers and peripherals. The maximum cable distance for SE should not exceed 20 ft. (6 m) total length. Black Box offers standard and custom SCSI cables for connecting the SCSI Switch to host devices and peripherals. Call Black Box Technical Support for details.
  • Page 24 CHAPTER 5: Configuration and Operation SC120A-R2 T ERMINATION ONFIGURATION Internal termination on Logic Component is always on by default and is not settable at the point of the logic components (see Figure 5-1). To ensure proper termination when configuring the switch termination, always have the termination enabled at the specified alphanumeric port and the termination disabled at the specified numeric port.
  • Page 25 2 X 2 SCSI MATRIX SWITCH Figure 5-2. SC120A-R2 termination example 1. Figure 5-3. SC120A-R2 termination example 2.

  • Page 26: Selecting Internal Terminator Power

    CHAPTER 5: Configuration and Operation 5.3 Selecting Internal Terminator Power On-board SCSI Switch terminators can be powered by internal 5-volt power or externally from SCSI-bus “terminator power” (TERMPWR). Internal 5V E13, E14, E19, E20 E15, E16, E21, E22 External Terminator Power Figure 5-4.

  • Page 27: Serial-Port Pinout

    2 X 2 SCSI MATRIX SWITCH Table 5-2. Jumper settings for external termination. SC120A-R2 SC121A E6-Port A E22-Port 1 E19-Port A E17-Port 1 E5-Port B E21-Port 2 E20-Port B E18-Port 2 NOTE The standard factory default connects internal terminators to internal 5 volts.

  • Page 28: Lan/Serial-Port Commands

    CHAPTER 5: Configuration and Operation 5.6 LAN/Serial-Port Commands You can use simple ASCII-character commands to control the SCSI Switch through either its LAN port (by opening a socket connection to port 3001) or one of its RS-232 serial ports. For serial control, set your computer’s serial port this way: a.
  • Page 29 2 X 2 SCSI MATRIX SWITCH Table 5-4. SCSI Switch commands. Command Cmd. Example Example Result or Char. Command String Response Select Port <cr>//|A1K<cr> A & 1 connected Report Port Status <cr>//|S<cr> “//|a2b0K” Select Terminator <cr>//|A1k<cr> A & 1 terminated Report Terminator Status <cr>//|s<cr>...
  • Page 30 CHAPTER 5: Configuration and Operation Table 5-4 (continued). SCSI Switch commands. Command Cmd. Example Example Result or Chars. Command String Response Enable/Disable Alarm <cr>//|OA0<cr> Alarm enabled Set Baud Rate <cr>//|OB10<cr> COM2 = 9600 bps Set Serial Port Mode <cr>//|OC0<cr> Daisychain enabled Set Switch Number <cr>//|OD06<cr>...
  • Page 31 2 X 2 SCSI MATRIX SWITCH XPANDED IST OF OMMANDS a. Select SCSI Port Matrix: example command: <cr>//|A1B2K<cr> report: none NOTE K - Connects specified ports, but also breaks former connections and maintains proper termination as per SCSI rules. N - Connects specified ports without regard for former connections or termination.
  • Page 32 CHAPTER 5: Configuration and Operation i. Report Temperature: example command: <cr>//|t<cr> example report: //|t+19.5 +19.5 = +19.5˚C, +67˚F j. Report SCSI-Bus Performance: example command: <cr>//|P<cr> report format: //|P<aabb1122><cr> For ports A, B, 1, and 2 respectively, aa, bb, 11, and 22 = ASCII representations of 8-bit hexadecimal values from 00 to FF, where 00 represents 0% busy (completely idle) and FF represents 100% busy k.
  • Page 33 2 X 2 SCSI MATRIX SWITCH p. Set Switch (Device) Number: example command: <cr>//|ODxx<cr> xx = ASCII representation of decimal value from 01 through 32 report: none q. Set “Lock/Unlock Front Panel” Password: example command: <cr>//|OPxxxx<cr> xxxx: ASCII 4-digit decimal number from 0000 to 9999 report: none r.

  • Page 34: Ascii Character Reference For Scsi Switch Box Selection

    CHAPTER 5: Configuration and Operation 5.7 ASCII Character Reference for SCSI Switch Box Selection Switch # ASCII <DEL> ` Switch # ASCII Switch # ASCII Switch # ASCII 5.8 Graphical User Interface (GUI) Your SCSI Switch is supplied with control software that is compatible with most recent Microsoft ®...

  • Page 35: Connecting Multiple Scsi Switches

    2 X 2 SCSI MATRIX SWITCH 5.9 Connecting Multiple SCSI Switches Up to 32 SCSI Switches can be controlled by a single RS-232 serial interface. To operate in this configuration, set the serial ports to operate in daisychained mode. In Figure 5-7, “1” is RS-232 port 1 on each switch and “2” is RS-232 port 2. Computer RS-232 SCSI Switch...

  • Page 36: Network Control Of Scsi Switch

    CHAPTER 5: Configuration and Operation 5.11 Network Control of SCSI Switch The 2 x 2 SCSI Matrix Switch may be controlled over a TCP/IP network through its LAN port. 5.11.1 LAN-P ONFIGURATION You can remotely control the SCSI Switch through a standard 10-Mbps Ethernet connection running TCP/IP.

  • Page 37: Cfgswitch Utility

    2 X 2 SCSI MATRIX SWITCH 5.11.2 A PCONCFG TILITY The apconcfg.exe utility is used to configure the TCP/IP address. This utility is provided on the included CD-ROM. You can reconfigure the IP address by using the IP Configuration Utility. Run apconcfg.exe from the CD-ROM provided with your 2 x 2 SCSI Matrix Switch.

  • Page 38: Apconcmd Utility

    CHAPTER 5: Configuration and Operation 5.11.3 A PCONCMD TILITY The apconcmd.exe utility enables the user to set switch parameters through the LAN port. This utility is located on the CD-ROM provided with your SCSI Switch. To change switch settings and termination for an SCSI Switch, run (at a DOS prompt) APCONCMD.EXE from the CD-ROM.

  • Page 39: Scsi Technical Information

    2 X 2 SCSI MATRIX SWITCH 6. SCSI Technical Information 6.1 SCSI Basics 6.1.1 SCSI-1 The original specification supports data transfers up to 5 MBps on an 8-bit wide parallel data bus. SCSI-1 standards had some incompatibility problems between host adapters and peripheral devices. The need to improve compatibility, increase transfer rates, and add other features for better performance required a review of the specifications.

  • Page 40: Common Problems

    CHAPTER 6: SCSI Technical Information 6.1.5 C OMMON ROBLEMS The majority of problems encountered with SCSI-bus installations are due to unbalanced or improper impedances on the SCSI-bus transmission cables caused by varying manufacturers’ peripheral devices. SCSI terminators compensate for these inherent impedance mismatches on a SCSI bus where peripheral devices such as hard drives, CD-ROM drives, scanners, or printers are used.

  • Page 41: Scsi Interface Signal Descriptions

    2 X 2 SCSI MATRIX SWITCH • If the last device on the chain has two SCSI connectors, attach the cable to one and a terminator to the other. Otherwise, you’ll have an open connector that may cause noise on the SCSI chain. •...
  • Page 42 CHAPTER 6: SCSI Technical Information • DB0 through DB15, P, P1 (DATA BUS): Sixteen data-bit signals and two parity- bit signals that together form a data bus. DB15 is the most significant bit and has the highest priority during the Arbitration phase. Bit number, significance, and priority decrease downward to DB0.
  • Page 43 2 X 2 SCSI MATRIX SWITCH Table 6-1 (continued). SCSI connector assignments for single-ended (SE) 16-bit SCSI (wide). Signal Name Pin Number Signal Name Pin Number Ground Ground Ground Ground TERMPWR TERMPWR TERMPWR TERMPWR Reserved Reserved Ground Ground Ground -ATN Ground Ground Ground...
  • Page 44 CHAPTER 6: SCSI Technical Information Table 6-1 (continued). SCSI connector assignments for single-ended (SE) 16-bit SCSI (wide). Signal Name Pin Number Signal Name Pin Number Ground -DB9 Ground -DB10 Ground -DB11 Table 6-2. SCSI connector assignments for differential 16-bit SCSI (wide). Signal Name Pin Number Signal Name...
  • Page 45 2 X 2 SCSI MATRIX SWITCH Table 6-2 (continued). SCSI connector assignments for differential 16-bit SCSI (wide). Signal Name Pin Number Signal Name Pin Number +DB(5) -DB(5) +DB(6) -DB(6) +DB(7) -DB(7) +DB(P) -DB(P) DIFFSENS Ground TERMPWR TERMPWR TERMPWR TERMPWR Reserved Reserved +ATN -ATN...
  • Page 46 CHAPTER 6: SCSI Technical Information Table 6-2 (continued). SCSI connector assignments for differential 16-bit SCSI (wide). Signal Name Pin Number Signal Name Pin Number +I/O -I/O Ground Ground +DB(8) -DB(8) +DB(9) -DB(9) +DB(10) -DB(10) +DB(11) -DB(11) Table 6-3. SCSI connector assignments for low-voltage differential (LVD) 16-bit SCSI (wide).
  • Page 47 2 X 2 SCSI MATRIX SWITCH Table 6-3 (continued). SCSI connector assignments for low-voltage differential (LVD) 16-bit SCSI (wide). Signal Name Pin Number Signal Name Pin Number +DB(4) -DB(4) +DB(5) -DB(5) +DB(6) -DB(6) +DB(7) -DB(7) +DB(P) -DB(P) Ground Ground DIFFSENS Ground TERMPWR TERMPWR...
  • Page 48 CHAPTER 6: SCSI Technical Information Table 6-3 (continued). SCSI connector assignments for low-voltage differential (LVD) 16-bit SCSI (wide). Signal Name Pin Number Signal Name Pin Number +SEL -SEL +C/D -C/D +REQ -REQ +I/O -I/O +DB(8) -DB(8) +DB(9) -DB(9) +DB(10) -DB(10) +DB(11) -DB(11)
  • Page 49 2 X 2 SCSI MATRIX SWITCH Table 6-4. SCSI distance/device support. STA Term Maximum Bus Length (M) Maximum Devices SCSI-1 — Fast SCSI — Fast Wide SCSI — Ultra SCSI — Ultra SCSI — — Wide Ultra SCSI — — Wide Ultra SCSI —...
  • Page 50 CHAPTER 6: SCSI Technical Information To access jumper options: Remove the four screws on the bottom of the unit. Then lift off the cover. Figure 6-1. SCSI Switch component placement. • Internal termination jumper block: E13, E14, E19, E20 on SC120A-R2 or E15, E16, E21, E22 on SC121A (see Section 5.3).

  • Page 51: Troubleshooting

    • Package it carefully. We recommend that you use the original container. • If you are shipping the switch for repair, make sure you include everything that came in the original package. Before you ship, contact Black Box to get a Return Authorization (RA) number.
  • Page 52 LEGAL INFORMATION DISCLAIMERS AND NOTICES The manufacturer specifically disclaims the implied warranties for this product of merchantability and fitness for a particular purpose. Some states and provinces do not allow limitations on how long an implied warranty lasts, so the above limitation or exclusion might not apply to you.
  • Page 53 © Copyright 2002. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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