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Black Box RS-232/422/485 manual

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  • Page 1

    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 JULY 2002[...]

  • Page 2

    1 FCC AND IC RFI ST A TEMENTS FEDERAL COMMUNICA TIONS COMMISSION and INDUSTR Y CANADA RADIO FREQUENCY INTERFERENCE ST A TEMENTS 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 aga[...]

  • Page 3

    2 DUAL- AND QUAD-POR T USB HUBS EMC Directive Statement 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: • EN55022 Class B—Limits and methods of measureme[...]

  • Page 4

    3 NOM ST A TEMENT NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY ST A TEMENT 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 [...]

  • Page 5

    4 DUAL- AND QUAD-POR T USB HUBS 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 recept?[...]

  • Page 6

    5 TRADEMARKS TRADEMARKS USED IN THIS MANUAL AT, IBM, and PS/2 are registered trademarks of International Business Machines Corporation. Windows is a registered trademark of Microsoft Corporation. Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.[...]

  • Page 7

    6 DUAL- AND QUAD-POR T USB HUBS Contents Chapter Page 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Overview . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 8

    7 1. Specifications Standards: USB version 1.1 Speed: RS-232: Up to 460.8 kbps; RS-422/485: Up to 921.6 kbps Indicators: IC1020A: (5) Status LEDs: (3) USB Enabled; (2) Port Activity; IC1021A, IC1022A: (9) Status LEDs: (5) USB Enabled; (4) Port Activity Connectors: IC1020A: (1) USB Type B; (2) DB9 male; IC1021A, IC1022A: (1) USB Type B, (4) DB9 male[...]

  • Page 9

    8 DUAL- AND QUAD-POR T USB HUBS 2. Introduction 2.1 Overview The USB Hub equips the PC with 2 or 4 USB to RS-232/422/485 or RS-422/485 asynchronous serial ports. It gives you a versatile interface for common serial needs. Three models are available: • The Dual-Port USB Hub (IC1020A) has 2 USB ports to RS-232/422/485 serial ports. • The Quad-Por[...]

  • Page 10

    9 CHAPTER 2: Introduction 2.4 Connector Pin Assignments The IC1020A has one USB Type B connector and two DB9 male connectors. The IC1021A and IC1022A have one USB Type B connector and four DB9 male connectors. The pinouts for the DB9 connectors are described in Tables 2-1 and 2-2. T able 2-1. RS-422/485 DB9 male connector pin assignments. Signal Na[...]

  • Page 11

    10 DUAL- AND QUAD-POR T USB HUBS 3. Installation 3.1 Operating System Installation Choose Install Software at the beginning of the CD and follow the prompts to install SeaCOM . 3.2 System Installation The screen capture shown in Figure 3-1 is taken from a Windows ® 98 installation. Your particular operating system may differ slightly from what is [...]

  • Page 12

    11 CHAPTER 3: Installation Figure 3-1. System Properties screen, Device Manager tab. You can access your new COM ports by using the assigned COM identifiers as shown in Figure 3-1. In this case, it is COM3, 4, 5, and 6. However, this assignment will vary from system to system. At this point, the hardware is recognized and ready to use.[...]

  • Page 13

    12 DUAL- AND QUAD-POR T USB HUBS 4. Configuration 4.1 Original Configuration This device ships with the following configuration: • 422 mode, • 120 ohm termination, • 1 K-ohm pull-up resistance on RX+, and • 1 K-ohm pull-down resistance on RX-. To change this configuration, you must open the box. Do this by removing the four screws located o[...]

  • Page 14

    13 CHAPTER 4: Configuration T able 4-1. Jumper settings. Jumper Port RS-232 RS-422/485 E5 2 X E6 2 X E7 1 X E8 1 X Switch SW4 Settings To configure the ports on the Dual-Port USB Hub for RS-422/RS-485 instead of RS-232, select Jumper E7 for Port 1 and Jumper E6 for Port 2. (See Table 4-1.) When you are running RS-422 or RS-485, you also need to set[...]

  • Page 15

    14 DUAL- AND QUAD-POR T USB HUBS T able 4-2. DIP-switch SW4 settings. Switch Switch Port Description RS-485 RS-422 Setting Number L SW4-1 1 TX+ to RX+ ON OFF L SW4-2 1 TX- to RX- ON OFF T SW4-3 1 Termination ON ON PD SW4-4 1 1K Pull-Down ON OFF PU SW4-5 1 1K Pull-Up ON OFF L SW4-6 2 TX+ to RX+ ON OFF L SW4-7 2 TX- to RX- ON OFF T SW4-8 2 Terminatio[...]

  • Page 16

    15 CHAPTER 4: Configuration T able 4-3. DIP-switch SW3 settings. Switch Switch Port Description RS-485 RS-422 Setting Number 485 SW3-1 1 485 Mode (4-wire) ON OFF NE SW3-2 1 485 Mode, No Echo (2-wire) ON OFF 485 SW3-3 2 485 Mode (4-wire) ON OFF NE SW3-4 2 485 Mode, No Echo (2-wire) ON OFF NE = No Echo. In a two-wire setup, the receiver will not echo[...]

  • Page 17

    16 DUAL- AND QUAD-POR T USB HUBS T able 4-4. DIP-switches SW2 and SW4 settings. Switch Switch Port Description RS-485 RS-422 Setting Number L SW2-1 3 TX+ to RX+ ON OFF L SW2-2 3 TX- to RX- ON OFF T SW2-3 3 Termination ON ON PD SW2-4 3 1K Pull-Down ON OFF PU SW2-5 3 1K Pull-Up ON OFF L SW2-6 4 TX+ to RX+ ON OFF L SW2-7 4 TX- to RX- ON OFF T SW2-8 4 [...]

  • Page 18

    17 CHAPTER 4: Configuration Figure 4-4. RS-422/485 interface configuration. NOTE Switch positions SW3-1 and 2 are for Port 1, SW3-3 and 4 are for Port 2, SW1-1 and 2 are for Port 3, and SW1-3 and 4 are for Port 4. T able 4-5. DIP-switch SW1 and SW3 settings. Switch Switch Port Description RS-485 RS-422 Setting Number 485 SW1-1 3 485 Mode (4-wire) O[...]

  • Page 19

    18 DUAL- AND QUAD-POR T USB HUBS each port. When selecting a configuration for your Hub, refer to Tables 4-6 through 4-8 and Figures 4-5 and 4-6. Jumpers E1, E2, E3, E4, E5, E6, E7, and E8 To configure Port 1 on the Quad-Port USB Hub for RS-232, select Jumper E8 on the circuit board. To configure Port 2 for RS-232, select Jumper E5. To configure Po[...]

  • Page 20

    19 CHAPTER 4: Configuration Figure 4-5. Switches SW2 and SW4. NOTE Switch positions SW4-1, 2, 3, 4, and 5 are for Port 1. Switch positions SW4-6, 7, 8, 9, and 10 are for Port 2. Switch positions SW2-1, 2, 3, 4, and 5 are for Port 3. Switch positions SW2-6, 7, 8, 9, and 10 are for Port 4. T able 4-7. DIP-switches SW2 and SW4 settings. Switch Switch [...]

  • Page 21

    20 DUAL- AND QUAD-POR T USB HUBS T able 4-7 (continued). DIP-switches SW2 and SW4 settings. Switch Switch Port Description RS-485 RS-422 Setting Number PD SW4-9 2 1K Pull-Down ON OFF PU SW4-10 2 1K Pull-Up ON OFF L = Loops TX+ to RX+ for two-wire operation. T = Adds a 120-ohm termination resistor between RX+ and RX-. PU = Pull-up. Adds a 1 K-ohm pu[...]

  • Page 22

    21 CHAPTER 4: Configuration T able 4-8. DIP-switch SW1 and SW3 settings. Switch Switch Port Description RS-485 RS-422 Setting Number 485 SW1-1 3 485 Mode (4-wire) ON OFF NE SW1-2 3 485 Mode, No Echo (2-wire) ON OFF 485 SW1-3 4 485 Mode (4-wire) ON OFF NE SW1-4 4 485 Mode, No Echo (2-wire) ON OFF 485 SW3-1 1 485 Mode (4-wire) ON OFF NE SW3-2 1 485 M[...]

  • Page 23

    22 DUAL- AND QUAD-POR T USB HUBS Appendix A. T roubleshooting A.1 T roubleshooting T ips Serial Utility test software is supplied on the included CD-ROM and will be used in the troubleshooting procedures. By using this software and following these simple steps, you can eliminate most common problems without calling Technical Support. 1. If your Hub[...]

  • Page 24

    23 A.2 Calling Black Box If you determine that your USB Hub is malfunctioning, do not attempt to alter or repair the unit. It contains no user-serviceable parts. Contact Black Box at 724-746-5500. Before you do, make a record of the history of the problem. We will be able to provide more efficient and accurate assistance if you have a complete desc[...]

  • Page 25

    24 DUAL- AND QUAD-POR T USB HUBS Appendix B. Electrical Inter faces B.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 DB9 connector, and subsequently the EIA[...]

  • Page 26

    25 B.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. RS-485 allows cable lengths up to[...]

  • Page 27

    26 DUAL- AND QUAD-POR T USB HUBS Appendix C: 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 t[...]

  • Page 28

    27 Because each bit in asynchronous communication is sent consecutively, it is easy to generalize asynchronous communication 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. The data rate and communication parameters for asynchronous communication have [...]

  • Page 29

    1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746 © Copyright 2002. Black Box Corporation. All rights reserved.[...]