Black Box IC920A User Manual
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Black Box IC920A User Manual

Black Box IC920A User Manual

Micro async to sync converter
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SEPTEMBER 1999
IC920A
Micro Async to Sync Converter
CUSTOMER SUPPORT INFORMATION
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
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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Summary of Contents for Black Box IC920A

  • Page 1 Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...

  • Page 2: Industry Canada

    MICRO ASYNC TO SYNC CONVERTER 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...
  • Page 3 MICRO ASYNC TO SYNC CONVERTER 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 MICRO ASYNC TO SYNC CONVERTER 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 5 MICRO ASYNC TO SYNC CONVERTER CONTENTS 1. Specifications ......5 2. Introduction......6 2.1 Description.

  • Page 6: Specifications

    MICRO ASYNC TO SYNC CONVERTER 1. Specifications Data Rates—Up to 19.2 kbps Clocking—Provided by modem or multiplexor Buffer—4-bit RTS override feature empties buffers before dropping RTS, so you can use the Converter in a polling environment Data Transmission—Full- or half-duplex Connectors—Async: DB25 female;...

  • Page 7: Introduction

    MICRO ASYNC TO SYNC CONVERTER 2. Introduction 2.1 Description The Micro Async to Sync Converter gives asynchronous hardware access to synchronous modems or multiplexors. The Converter plugs directly into the asynchronous RS-232 DTE port and connects via RS-232 cable to the synchronous DCE device. Drawing power from the RS-232 interface, the Converter needs no AC power or batteries to operate and supports data rates to 19.2 kbps.

  • Page 8: Features

    MICRO ASYNC TO SYNC CONVERTER 2.2 Features • Conforms to CCITT V.14 and V.22 standards • Adapts asynchronous terminals to synchronous modems and multiplexors • Allows character lengths from 8 to 11 bits • Requires no AC power or batteries •...

  • Page 9: Configuration

    MICRO ASYNC TO SYNC CONVERTER 3. Configuration You can configure the Converter via four internal switches. Figure 3-1 shows where the switches are on the printed circuit board. Configuration Switches Figure 3-1. Switch locations on the PC board. 3.1 Setting Internal Switches The four switches shown in Figure 3-2 allow selection of character length and extended signaling rate.
  • Page 10 MICRO ASYNC TO SYNC CONVERTER Figure 3-2. Closeup of the Converter’s configuration switches. Figure 3-3. Opening the Converter’s case with a small screwdriver.

  • Page 11: Switch Settings

    3.2 Switch Settings All possible settings for the Converter’s configuration switches are presented in Table 3-1. If you have additional questions about configuration, call Black Box Technical Support at 724-746-5500. Switches SW1-1 and SW1-2 are set in combination to determine the character length for asynchronous data.
  • Page 12 MICRO ASYNC TO SYNC CONVERTER SW1-3: E (ESR) WITCH XTENDED IGNALING The setting for switch 1-3 determines the range of variability the Converter looks for in asynchronous data rates (the actual variance from a given frequency level the Converter will tolerate). SW1-3 -2.5% to +1% -2.5% to +2.3%...

  • Page 13: Installation

    DTE and a synchronous DCE on either end of a synchronous communciation link. Figure 4-1 illustrates a typical Converter installation. Sync DCE Sync DCE IC920A IC920A Async DTE Async DTE Figure 4-1. Typical Converter application. 4.1 Connecting the Asynchronous Port The asynchronous port of the Converter is a DB25 female and is configured as DCE.

  • Page 14: Connecting The Synchronous Port

    MICRO ASYNC TO SYNC CONVERTER 4.2 Connecting the Synchronous Port The synchronous port of the Converter is a DB25 male and is configured as DTE. Therefore, it wants to talk to a DCE device such as a modem or a multiplexor. You can plug the Converter directly into the DB25 serial port of a DCE or connect it via “straight-through”...
  • Page 15 MICRO ASYNC TO SYNC CONVERTER Appendix A: Asynchronous Port Connections (Configured as DCE) Name Description Frame Ground; connected straight through to synchronous port Transmit Data (to Converter); data input from asynchronous port; input to the Converter’s power supply Receive Data (from Converter); data output to asynchronous port Request to Send (to Converter);...
  • Page 16 MICRO ASYNC TO SYNC CONVERTER Appendix B: Synchronous Port Connections (Configured as DTE) Name Description Frame Ground; connected straight through to asynchronous port Transmit Data (from Converter); data output to synchronous port Receive Data (to Converter); data input from the synchronous port;...
  • Page 17 MICRO ASYNC TO SYNC CONVERTER Name Description Receive clock (to Converter); used to synchronize data conversion from Converter to synchronous port Data Terminal Ready (from Converter) Ring Indicator (to Converter); connected straight through to asynchronous port...

  • Page 18: Appendix C: Block Diagram

    MICRO ASYNC TO SYNC CONVERTER Appendix C: Block Diagram Asynchronous Synchronous TD 2 2 TD Micro Async RD 3 3 RD to Sync Converter Format 17 RC Phase Locked 15 TC Loop RTS 4 RTS Delay 4 RTS Pins 1, 5, 6, 7, 8, 9, 10, 20, and 22 are connected straight through Figure C-1.
  • Page 19 © Copyright 1999. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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