Black Box 2-Port RS-232/422/485 User Manual
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Black Box 2-Port RS-232/422/485 User Manual

Black Box 2-Port RS-232/422/485 User Manual

2-port rs-232/422/485 pci host adapter
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AUGUST 2000
IC133C-R2
IC187C
2-Port RS-232/422/485
PCI Host Adapter
CUSTOMER
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
SUPPORT
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
INFORMATION
Mail order: 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. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX SUPPORT FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 INFORMATION Mail order: 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 STATEMENTS FEDERAL COMMUNICATIONS COMMISSION 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...
  • Page 3 2-PORT RS-232/422/485 PCI HOST ADAPTER EUROPEAN UNION DECLARATION OF CONFORMITY Products bearing the CE Label fulfill the requirements of the EMC directive (89/336/EEC) and of the low-voltage directive (73/23/EEC) issued by the European Commission. To obey these directives, the following European standards must be met: •...
  • Page 4 NOM STATEMENT 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 5 2-PORT RS-232/422/485 PCI HOST ADAPTER 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 6: Table Of Contents

    4.1.5 Other Operating Systems ............21 4.2 Installing the Hardware..............21 5. Troubleshooting ..................22 5.1 The Serial Utility Diskette ..............22 5.2 Calling Black Box................23 5.3 Shipping and Packaging..............23 Appendix A: Interrupt Handling ...............24 A.1 The Purpose and Early History of Interrupts........24 A.2 Why Use an ISP? ................25 Appendix B: Connector Pinouts ..............26...
  • Page 7 2-PORT RS-232/422/485 PCI HOST ADAPTER CONTENTS (continued) Appendix C: Electrical Interfaces...............28 C.1 RS-232....................28 C.2 RS-422....................28 C.3 RS-485....................29 Appendix D: Asynchronous Communications ..........30 Appendix E: Board Layout................32...

  • Page 8: Specifications

    CHAPTER 1: Specificatiobns 1. Specifications Communication Chip — IC133C-R2: 16550 UART (optionally, you can remove this UART and install a 16950 UART for better performance); IC187C: 16950 UART Data Rate — IC133C-R2: Up to 460.8 kbps; IC187C: 460.8 kbps and above Distance —...

  • Page 9: Introduction

    2-PORT RS-232/422/485 PCI HOST ADAPTER 2. Introduction 2.1 Overview The 2-Port RS-232/422/485 PCI Host Adapter is a two-channel PCI-bus serial I/O adapter for PCs and compatibles that supports data rates up to 460.8 kbps. It has two very versatile asynchronous serial ports: They are field-selectable as either RS-232 ports (suitable for communication with modems, printers and plotters) or RS-422/485 ports (suitable for industrial automation and control applications).

  • Page 10: Factory Default Settings

    CHAPTER2: Introduction 2.3 Factory Default Settings The Adapter’s factory-default settings are as follows: Table 2-1. Factory-Default Settings Port # Electrical Specification Port 1 RS-232 Port 2 RS-232 For your reference, record installed Adapter settings below. Table 2-2. Installed Adapter Settings Port # Electrical Specification Port 1...

  • Page 11: Card Setup

    2-PORT RS-232/422/485 PCI HOST ADAPTER 3. Card Setup NOTE In all cases J1x refers to settings for the first port and J2x refer to settings for the second port. 3.1 RS-485 Enable Modes RS-485 is ideal for multidrop or network environments. RS-485 requires a tri-state driver that will allow the electrical presence of the driver to be removed from the line.
  • Page 12 CHAPTER 3: Card Setup Examples on the following pages describe all of the valid settings for J1B and J2B. Interface Mode Examples J1D – J4D Figure 3-1. Headers J1B and J2B set for RS-422. Figure 3-2. Headers J1B and J2B set for RS-485 “Auto” with “No Echo.” Figure 3-3.

  • Page 13: Address And Irq Selection

    2-PORT RS-232/422/485 PCI HOST ADAPTER Figure 3-4. Headers J1B and J2B set for RS-485 “RTS” with “No Echo.” Figure 3-5. Headers J1B and J2B set for RS-485 “RTS” with “Echo.” 3.2 Address and IRQ selection The Adapter is automatically assigned I/O addresses and IRQs by your motherboard BIOS.
  • Page 14 CHAPTER 3: Card Setup Table 3-1. Jumper Operation Name Function Adds or removes the 1K-ohm pull-down resistor in the RS-422/RS-485 receiver circuit (Receive data only). Adds or removes the 120-ohm termination. Connects the TX+ to RX+ for RS-485 two-wire operation. Connects the TX- to RX- for RS-485 two-wire operation.

  • Page 15: Electrical Interface Selection

    2-PORT RS-232/422/485 PCI HOST ADAPTER 3.4 Electrical Interface Selection Each port on the Adapter has the ability to be used in either RS-232 or RS-422/485 mode. This is selectable via four 24 pin DIP-shunts at E1-E4. Please use the following illustration to aid in the configuration of your electrical interface. RS-232 RS-422/485 RS-232 and RS-422/485...

  • Page 16: Clock Modes

    CHAPTER 3: Card Setup 3.5 Clock Modes The Adapter employs a clocking option that allows you to select from “divide by 4,” “divide by 2,” and “divide by 1” clocking modes. These modes are selected at Headers J1C through J4C. To select the baud rates commonly associated with COM ports (for example, 2400, 4800, 9600, and 19,200 bps, and so on up to 115.2 kbps), place the jumper in the “divide by 4”...

  • Page 17: Baud Rates And Divisors For The "Div1" Mode

    2-PORT RS-232/422/485 PCI HOST ADAPTER To enable the Adapter to reach its maximum possible data rate, 460.8 Kbps, place the jumper in the “divide by 1” position (marked DIV1). DIV1 DIV2 DIV4 Figure 3-10. Clocking mode “divide by 1.” 3.6 Baud Rates and Divisors for the “Div1” Mode The following table shows some common data rates and the rates you should choose to match them if you’re using the Adapter in the “Div1”...
  • Page 18 CHAPTER 3: Card Setup If your communications package allows the use of baud-rate divisors, choose the appropriate divisor from the following table: Table 3-3. Divisors for the “Div 1” Mode For this Data Rate Choose this Divisor 1200 bps 2400 bps 4800 bps 9600 bps 19.2 kbps...

  • Page 19: Baud Rates And Divisors For The "Div2" Mode

    2-PORT RS-232/422/485 PCI HOST ADAPTER 3.7 Baud Rates and Divisors for the “Div2” mode The following table shows some common data rates and the rates you should choose to match them if you’re using the adapter in the “Div2” mode. Table 3-4.
  • Page 20 CHAPTER 3: Card Setup Table 3-5. Divisors for the “Div 2” Mode For this Data Rate Choose this Divisor 1200 bps 2400 bps 4800 bps 9600 bps 19.2 kbps 38.4 kbps 57.6 kbps 115.2 kbps 230.4 kbps...

  • Page 21: Installation

    Serial Utilities Diskettes before installing the card. Power down the computer and install the adapter. The resources are automatically configured for the PCI card. Refer to the appropriate help file in the Black Box folder located in the Start, Programs menu for changing those resources.

  • Page 22: Windows Nt

    CHAPTER 4: Installation 5. Next, double-click on the third I/O range. Highlight the entire I/O range and type 02e8–02ef for COM4. Again, Windows will inform you that you have made modifications that may affect other devices. Click OK. Following these steps will change the COM: number assignments on the first two ports to COM3 and COM4.

  • Page 23: Troubleshooting

    2-PORT RS-232/422/485 PCI HOST ADAPTER 5. Troubleshooting 5.1 The Serial Utility Diskette The Adapter comes with a Serial Utility Diskette that has diagnostic software on it. We recommend that you always use this software first when you troubleshoot problems, because it can help resolve most common problems related to software and operating-system incompatibilities without requiring you to call Technical Support.

  • Page 24: Calling Black Box

    • Package it carefully. We recommend that you use the original container. • If you are returning the Adapter, make sure you include everything you received with it. Before you ship, contact Black Box to get a Return Authorization (RA) number.

  • Page 25: Appendix A: Interrupt Handling

    2-PORT RS-232/422/485 PCI HOST ADAPTER Appendix A: Interrupt Handling A.1 The Purpose and Early History of Interrupts A good analogy of a PC interrupt would be the phone ringing. The phone “bell” is a request for us to stop what we are currently doing and take up another task (speak to the person on the other end of the line).

  • Page 26: Why Use An Isp

    APPENDIX A: Interrupt Handling A.2 Why Use an Interrupt Status Port (ISP)? The answer to the polling inefficiency was the Interrupt Status Port (ISP). The ISP is a read-only 8-bit register that sets a corresponding bit when an interrupt is pending.

  • Page 27: Appendix B: Connector Pinouts

    2-PORT RS-232/422/485 PCI HOST ADAPTER Appendix B: Connector Pinouts B.1 RS-232 Table B-1. Pinout of Connector Set to RS-232 Abbreviation Name Pin # Mode Transmit Data Output Request To Send Output Data Term Ready Output Ground Receive Data Input Data Carrier Detect Input Data Set Ready Input...

  • Page 28: B.2 Rs-422/485

    APPENDIX B: Connector Pinouts B.2 RS-422/485 Table A-2. Pinout of Connector Set to RS-422/485 Abbreviation Name Pin # Mode Ground TX + Transmit Data Positive Output Transmit Data Negative Output RTS+ Request To Send Positive Output RTS- Request To Send Negative Output Receive Data Positive Input...

  • Page 29: Appendix C: Electrical Interfaces

    2-PORT RS-232/422/485 PCI HOST ADAPTER Appendix C: Electrical Interfaces C.1 RS-232 Quite possibly the most widely used communication standard is RS-232. This implementation has been defined and revised several times and is often referred to as EIA/TIA-232. The IBM PC/AT computer defined the RS-232 port on a 9-pin D-subminiature connector, and subsequently the EIA/TIA approved this implementation as the EIA/TIA-574 standard.

  • Page 30: C.3 Rs-485

    APPENDIX C: Asynchronous Communications C.3 RS-485 RS-485 is backward-compatible with RS-422; however, it is optimized for partyline or multidrop applications. The output of the RS-422/485 driver is capable of being Active (enabled) or Tristate (disabled). This capability allows multiple ports to be connected in a multidrop bus and selectively polled.
  • Page 31 2-PORT RS-232/422/485 PCI HOST ADAPTER Appendix D: Asynchronous Communication In serial data communication, 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 32: Appendix D: Asynchronous Communications

    APPENDIX D: Asynchronous Communication Because each bit in asynchronous communications is sent consecutively, it is easy to generalize asynchronous communications by stating that each character is wrapped (framed) by pre-defined bits to mark the beginning and end of the serial transmission of the character.

  • Page 33: Appendix E: Board Layout

    2-PORT RS-232/422/485 PCI HOST ADAPTER Appendix E: Board Layout 7201 • JxB JUMPER SETTINGS • RS422 - REMOVE ALL JUMPERS RS485 - AT= AUTO ENABLE RS485 - RT= RTS ENABLE RS485 - NE= NO ECHO GD75232 Port 1 HEADER24PINW XC9536-7201 R16 R20 R24 Port 1 Port 2...
  • Page 34 NOTES...
  • Page 35 NOTES...
  • Page 36 © Copyright 2000. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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