ASCII Controls


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Michael P Frank ASCII controls v2 2 doc 9 15 06 Discussion of the Intended Meanings of the Nonprintable ASCII Characters Michael P Frank FAMU FSU College of Engineering Friday September 15 2006 This document discusses how the invisible ASCII characters that is the page C0 control characters codes 0016 1F16 along with the SP 2016 and DEL 7F16 characters were apparently intended to be used originally and also something about how they are used in practice presently This discussion is based loosely on ANSI X3 4 1986 ISO 646 1983 ISO IEC 6429 and other official standards specifications However some of the below material is also a matter of interpretation or educated guesswork based on experience The symbol glyphs that I use to graphically represent the control characters in the examples are my own notation and are not standard The choice of these characters is explained in a companion document A Proposed Set of Mnemonic Symbolic Glyphs for the Visual Representation of C0 Controls and Other Nonprintable ASCII Characters The section on transmission control characters needs to be updated to incorporate information from ANSI X3 28 1976 American National Standard for the Use of the Communication Control Characters of American National Standard Code for Information Interchange in Specified Data Communication Links Likewise the sections covering the use of the shift in shift out and escape characters need to be updated to integrate information from ANSI X3 41 1974 Code Extension Techniques for Use with the 7 Bit Coded Character Set of American National Standard Code for Information Interchange or equivalently ISO 2022 1973 1 Characters Addressed in this Document Table 1 gives the complete list of characters whose meanings are discussed in this document Table 1 Table of characters discussed in this document The first column gives the code point in ANSI X3 4 s notation The next four columns give the hexadecimal decimal octal and binary equivalents Next is the control sequence

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