Black Box IC133C-R2, IC187C manual Appendix D Asynchronous Communication

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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. The data rate and communication parameters for asynchronous communications have to be the same at both the transmitting and receiving ends. The communication parameters are baud rate, parity, number of data bits per character, and stop bits (usually listed in that order, like this: 9600,N,8,1).

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Contents Port RS-232/422/485 PCI Host Adapter FCC and IC Statements Port RS-232/422/485 PCI Host Adapter NOM Statement Trademarks Table of Contents Contents Specifications Number of Ports 2 RS-232/422/485 Connectors 2 DB9 maleWhat’s Included IntroductionOverview Factory Default Settings IntroductionCard Setup RS-485 Enable ModesCard Setup Address and IRQ selection Line TerminationName Function RS-232 and RS-422/485 Electrical Interface SelectionDIV1 DIV2 DIV4 Clock ModesBaud Rates and Divisors for the Div1 Mode 10. Clocking mode divide byFor this Data Rate Choose this Divisor Baud Rates and Divisors for the Div2 mode Divisors for the Div 2 Mode Installation Setting Up the Operating SystemInstalling the Hardware InstallationTroubleshooting Serial Utility DisketteCalling Black Box Shipping and PackagingAppendix a Interrupt Handling Purpose and Early History of InterruptsWhy Use an Interrupt Status Port ISP? Appendix B Connector Pinouts RS-232RS-422/485 Appendix C Electrical Interfaces RS-422RS-485 Figure D-1. Bit diagram for asynchronous communication Appendix D Asynchronous CommunicationAppendix D Asynchronous Communication Appendix E Board Layout J2CPage Page Copyright 2000. Black Box Corporation. All rights reserved
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