Black Box RS-232 User Manual
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Black Box RS-232 User Manual

Single-port pci card, opto-isolated
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Download this manual See also: Instruction Manual, User Manual
MARCH 2004
IC972C-R2
RS-232/422/485 Single-Port
PCI Card, Opto-Isolated
CUSTOMER SUPPORT INFORMATION
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
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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  • Page 1 Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 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 AND IC RFI STATEMENTS FEDERAL COMMUNICATIONS COMMISSION and INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS Class B Digital Device. This equipment has been tested and found to comply with the limits for a Class B computing device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
  • Page 3 RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult an experienced radio/TV technician for help. CAUTION Changes or modifications not expressly approved by the party responsible for compliance could void the user’s...
  • Page 4 EU DECLARATION OF CONFORMITY EUROPEAN UNION DECLARATION OF CONFORMITY This equipment complies with the requirements of the European EMC Directive 89/336/EEC.
  • Page 5 RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED 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 6 NOM STATEMENT 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.
  • Page 7 RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED TRADEMARKS USED IN THIS MANUAL IBM and PS/2 are registered trademarks of International Business Machines Corporation. Windows and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the United States and other countries.

  • Page 8: Table Of Contents

    CONTENTS Contents Chapter Page Specifications ......9 Introduction ......10 2.1 Overview .
  • Page 9 Appendix B. Electrical Interfaces ....26 B.1 RS-232 ......26 B.2 RS-422 .

  • Page 10: Specifications

    UART: 16850 Speed: RS-422/485: Up to 460.8 kbps Maximum Distance: RS-422: Up to 4000 ft. (1219.2 m) MTBF: Greater than 150,000 hours (calculated) Interface: RS-232/422/485, Opto-Isolated Connectors: (1) DB25 male Indicators: None Temperature Tolerance: Operating: 32 to 122°F (0 to 50°C);...

  • Page 11: Introduction

    128-byte FIFOs, it provides a field-selectable RS-232/422/485 serial port that supports data rates up to 460.8 kbps (RS-422/485). Configure the PCI card as RS-232 for standard serial COM: port requirements. Choose the RS-422 mode for long-distance device connections up to 4000 ft.

  • Page 12: What The Package Includes

    CHAPTER 2: Introduction In both RS-232 and RS-422 modes, the card works seamlessly with the standard operating system serial driver. In RS-485 mode, our special auto-enable feature allows the RS-485 ports to be viewed by the operating system as a COM: port. This means that the standard COM: driver can be used for RS-485 communications.

  • Page 13: Factory-Default Settings

    To install the PCI card using factory-default settings, refer to Chapter 4. 2.4 Technical Description The RS-232/422/485 Single-Port PCI Card, Opto- Isolated provides a PCI interface adapter with an isolated asynchronous serial port that gives you a versatile interface, field-selectable as RS-232 for modems, printers and plotters, as well as RS-422/485 for industrial automation and control applications.

  • Page 14: Connector Pin Assignments

    CHAPTER 2: Introduction 2.5 Connector Pin Assignments Table 2-1. RS-232 signals (DB25 male). Signal Name Pin # Mode Ground — Receive Data Input Clear To Send Input Transmit Data Output Request To Send Output NOTE These assignments meet EIA/TIA/ANSI-232E DTE standards.

  • Page 15: Card Setup

    RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED 3. Card Setup 3.1 Electrical Interface Selection The RS-232/422/485 Single-Port PCI Card can be used as RS-232, RS-422, or RS-485. This is selectable via DIP-switch SW1. Please use the following examples to configure your PCI card. Figure 3-1. RS-232.
  • Page 16 CHAPTER 3: Card Setup Figure 3-3. RS-485 4-wire with echo. Figure 3-4. RS-485 2-wire with echo. Figure 3-5. RS-485 2-wire without echo.

  • Page 17: Line Termination

    RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED 3.2 Line Termination Typically, each end of the RS-485 bus must have line-terminating resistors (RS-422 terminates at the receive end only). A 120-ohm resistor is across each RS-422/485 input in addition to a 1K ohm pull-up/ pull-down combination that biases the receiver inputs.

  • Page 18: Rs-485 Enable Modes

    You can effectively use the PCI card in an RS-485 application with existing (that is, standard RS-232) software drivers. Switch SW2 is used to control the RS-485 mode functions for the driver circuit (see Figure 3-6). The selections are RTS Enable (silk-screen “RT,”...
  • Page 19 RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED enables/disables the RS-485 interface. The RTS mode uses the RTS modem control signal to enable the RS-485 interface and provides backward compatibility with existing software products. SW2 RS-232/ SW2 RS-485 422 Default Auto Enabled D D A R...

  • Page 20: Clock Modes

    CHAPTER 3: Card Setup 3.4 Clock Modes The PCI card uses a unique clocking option that lets you select from “divide by 4” and “divide by 1” clocking modes. These modes are selected at switches SW-2. To select the baud rates commonly associated with COM: ports (that is, 2400, 4800, 9600, 19.2, …...
  • Page 21 RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED Table 3-2. Baud rates. For this Data Rate Choose this Data Rate 1200 bps 300 bps 2400 bps 600 bps 4800 bps 1200 bps 9600 bps 2400 bps 19.2 kbps 4800 bps 57.6 kbps 14.4 kbps 115.2 kbps...

  • Page 22: Installation

    Refer to the appropriate section of the Serial Utilities Software. 4.2 System Installation The RS-232/422/485 Single-Port PCI Card, Opto- Isolated can be installed in any of the PCI expansion slots and contains several jumper straps for each port that must be set for proper operation.
  • Page 23 RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED 4. Gently insert the PCI card into the slot. Make sure that the card is seated properly. 5. Replace the screw. 6. Replace the cover. 7. Connect the power cord. Installation is complete.

  • Page 24: Appendix A. Troubleshooting

    APPENDIX A: Troubleshooting Appendix A. Troubleshooting A.1 Tips Using the supplied software and following these simple steps can eliminate most common problems. 1. Identify all I/O adapters currently installed in your system. This includes your on-board serial ports, controller cards, sound cards, etc. The I/O addresses used by these adapters, as well as the IRQ (if any) should be identified.

  • Page 25: Calling Black Box

    If none of the above steps solved the problem, please refer to Section A.2. A.2 Calling Black Box If you determine that your RS-232/422/485 Single-Port PCI Card, Opto-Isolated is malfunctioning, do not attempt to alter or repair the unit. It contains no user-...

  • Page 26: Shipping And Packaging

    • any particular application that, when used, appears to create the problem or make it worse. A.3 Shipping and Packaging If you need to transport or ship your RS-232/422/485 Single-Port PCI Card, Opto-Isolated: • Package it carefully. We recommend that you use the original container.

  • Page 27: Appendix B. Electrical Interfaces

    Terminating Equipment Employing Serial Binary Data Interchange. Both implementations are in wide-spread use and will be referred to as RS-232 in this document. RS-232 is capable of operating at data rates up to 20 kbps at distances less than 50 ft (15.2 m). The absolute maximum data rate may vary due to line conditions and cable lengths.

  • Page 28: B.2 Rs-422

    In contrast, a single-ended interface (such as RS-232) defines the logic levels as the difference in voltage between a single signal and a common ground connection. Differential interfaces are typically more immune to noise or voltage spikes that may occur on the communication lines.

  • Page 29: B.3 Rs-485

    RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED B.3 RS-485 RS-485 is backward compatible with RS-422; however, it is optimized for partyline or multi-drop applications. The output of the RS-422/485 driver is capable of being Active (enabled) or Tri-State (disabled). This capability allows multiple ports to be connected in a multi-drop bus and selectively polled.
  • Page 30 APPENDIX B: Electrical Interfaces modem control signals. RS-485 does not define a physical connector.

  • Page 31: Appendix C. Ground Loop Phenomenon

    RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED Appendix C. Ground Loop Phenomenon C.1 What is Ground Loop? Ground loop phenomenon occurs when two (or more) pieces of equipment are connected together with a common ground, and a different ground potential exists at each location. This current can cause the connected equipment to experience noise that, in turn, causes data transmission errors.
  • Page 32 APPENDIX C: Ground Loop Phenomenon Figure C-1. PCI card cabling example.

  • Page 33: Appendix D. Asynchronous Communication

    RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED Appendix D. Asynchronous Communication Serial data communication implies that individual bits of a character are transmitted consecutively to a receiver that assembles the bits back into a character. Data rate, error checking, handshaking, and character framing (start/stop bits) are pre-defined and must correspond at both the transmitting and receiving ends.
  • Page 34 APPENDIX D: Asynchronous Communication Figure D-1.Asynchronous communication bit diagram. This special bit is called the parity bit. Parity is a simple method of determining if a data bit has been lost or corrupted during transmission. There are several methods for implementing a parity check to guard against data corruption.
  • Page 35 RS-232/422/485 SINGLE-PORT PCI CARD, OPTO-ISOLATED transmitting and receiving ends. The communication parameters are baud rate, parity, number of data bits per character, and stop bits (that is, 9600, N, 8, 1).

  • Page 36: Appendix E. Board Layout

    APPENDIX APPENDIX E: Board Layout Appendix E. Board Layout 2.2" (5.6 cm) 4.7" (11.9 cm)
  • Page 37 © Copyright 2004. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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