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Serial Input/Output and Modems

  • W. F. Stoecker
  • P. A. Stoecker

Abstract

Chapter 14 explained how data in parallel form may be transmitted from and received by a microcomputer. All the lines of a port are simultaneously sending or receiving data. In contrast, the serial mode of data transmission sends bits of data one at a time along a single conductor, as in Fig. 15-1a. A high voltage may appear at one time and a low voltage an instant later, as shown in Fig. 15-1b. If the voltage is high for 1/300 s, in one type of serial data transmission, for example, that signal could mean a 1 and if low it could mean a zero. A high voltage for 1/150 s is interpreted as two 1’s in succession. Instead of a voltage signal, pulses of current and the lack of them could indicate 0’s and 1’s. Sending parallel data requires eight conductor lines, while a rudimentary system transmitting serial data requires only one line plus a ground line.

Keywords

Status Register Shift Register Telephone Line Asynchronous Communication Acoustic Coupler 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Interface Between Data Terminal Equipment and Data Communication Equipment Employing Serial Binary Interchange, Standard RS-232-C, Catalog 3, Electronic Industrial Association, 2001 Eye Street, NW, Washington, DC 20006.Google Scholar
  2. 2.
    J. E. Oleksy and G. B. Rutkowski, Microprocessor and Digital Computer Technology, Prentice-Hall, Englewood Cliffs, NJ, 1981.Google Scholar
  3. 3.
    J. E. McNamara, Technical Aspects of Data Communication, Digital Press, Bedford, MA, 1977.Google Scholar

Copyright information

© Van Nostrand Reinhold 1989

Authors and Affiliations

  • W. F. Stoecker
    • 1
  • P. A. Stoecker
    • 2
  1. 1.University of IllinoisUrbana-ChampaignUSA
  2. 2.Hewlett-Packard CompanyUSA

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