ISO 2047
ISO 2047 (Information processing – Graphical representations for the control characters of the 7-bit coded character set) is a standard for graphical representation of the control characters for debugging purposes, such as may be found in the character generator of a computer terminal; it also establishes a two-letter abbreviation of each control character.[1] It started out as ANSI X3.32-1973 (American National Standard – Graphic Representation of the Control Characters of American National Standard Code for Information Interchange in 1973[2] and became an ISO standard in 1975.[1] In addition, RFC 1345 "Character Mnemonics & Character Sets" is cited as the ISO 2047 two-letter abbreviation of the control character. ISO 2047, ECMA-17[3] in Europe, GB/T 3911-1983 in China, that corresponds to KS X 1010[4] in Korea (formerly KS C 5713) has been established as a standard. It was enacted "graphical representation of information exchange capabilities for character" JIS X 0209:1976 (former JIS C 6227) in Japan, and was abolished on January 20, 2010.
While the ISO/IEC 646 three-letter abbreviation (such as "ESC"), or caret notation (such as "^[") are still in use, the graphical symbols of ISO 2047 are considered outdated and rare.[5]
Character Table[edit]
| Code (hex) |
Common abbreviation |
Name | Symbol[1][3][6][7][8] | 2-letter abbreviation | |
|---|---|---|---|---|---|
| 00 | NUL | Null | ⎕ | U+2395 | NU |
| 01 | TC₁, SOH | Start of Heading | ⌈ | U+2308 | SH |
| 02 | TC₂, STX | Start of Text | ⊥ | U+22A5 | SX |
| 03 | TC₃, ETX | End of Text | ⌋ | U+230B | EX |
| 04 | TC₄, EOT | End of Transmission | ⌁ | U+2301[9] | ET |
| 05 | TC₅, ENQ | Enquiry | ⊠[10] | U+22A0 | EQ |
| 06 | TC₆, ACK | Acknowledge | ✓ | U+2713 | AK |
| 07 | BEL | Bell | ⍾ | U+237E[9] | BL |
| 08 | FE₀, BS | Backspace | ⤺ | —[11] | BS |
| 09 | FE₁, HT | Horizontal Tabulation | ⪫ | U+2AAB | HT |
| 0A | FE₂, LF | Line Feed | ≡ | U+2261 | LF |
| 0B | FE₃, VT | Vertical Tabulation | ⩛ | U+2A5B | VT |
| 0C | FE₄, FF | Form Feed | ↡ | U+21A1 | FF |
| 0D | FE₅, CR | Carriage Return | ⪪ | U+2AAA | CR |
| 0E | SO | Shift Out | ⊗ | U+2297 | SO |
| 0F | SI | Shift In | ⊙ | U+2299 | SI |
| 10 | TC₇, DLE | Data Link Escape | ⊟ | U+229F | DL |
| 11 | DC₁, XON, CON[12] | Device Control 1 | ◷ | U+25F7 | D1 |
| 12 | DC₂, RPT,[12] TAPE[13] | Device Control 2 | ◶ | U+25F6 | D2 |
| 13 | DC₃, XOF, XOFF | Device Control 3 | ◵ | U+25F5 | D3 |
| 14 | DC₄, COF, KMC,[12] |
Device Control 4 | ◴ | U+25F4 | D4 |
| 15 | TC₈, NAK | Negative Acknowledge | ⍻ | U+237B[9] | NK |
| 16 | TC₉, SYN | Synchronization | ⎍ | U+238D | SY |
| 17 | TC₁₀, ETB | End of Transmission Block | ⊣ | U+22A3 | EB |
| 18 | CAN | Cancel | ⧖ | U+29D6 | CN |
| 19 | EM | End of Medium | ⍿ | U+237F[9] | EM |
| 1A | SUB | Substitute Character | ␦ | U+2426[14] | SB |
| 1B | ESC | Escape | ⊖ | U+2296 | EC |
| 1C | IS₄, FS | File Separator | ◰ | U+25F0 | FS |
| 1D | IS₃, GS | Group Separator | ◱ | U+25F1 | GS |
| 1E | IS₂, RS | Record Separator | ◲ | U+25F2 | RS |
| 1F | IS₁ US | Unit Separator | ◳ | U+25F3 | US |
| 20 | SP | Space | △ | U+25B3 | SP |
| 7F | DEL | Delete | —[15] | DT | |
References[edit]
- ^ a b c "ISO 2047:1975 Information processing – Graphical representations for the control characters of the 7-bit coded character set". ISO. ISO. Retrieved 13 April 2020.
- ^ American National Standard – Graphic Representation of the Control Characters of American National Standard Code for Information Interchange, American National Standards Institute, 3 July 1973
- ^ a b ECMA-17, Graphic Representation of the Control Characters of the ECMA 7-Bit Coded Character Set for Information Interchange (withdrawn)
- ^ KS X 1010-2007 Graphical representations control characters for Information interchange
- ^ Agim Çami, Control characters in ASCII and Unicode, Agim Çami – Computer Architecture web site, 1 July 2019
- ^ Michael P. Frank, A Proposed Set of Mnemonic Symbolic Glyphs for the Visual Representation of C0 Controls and Other Nonprintable ASCII Characters, 14 September 2006 (mirror)
- ^ Information Representation, 28 August 2016 – This is the site cited by Michael P. Frank
- ^ Information Technology - Irish 7-bit coded character sets, 13 December 1995 – Note that in this article the glyphs for ENQ, BS, CR and SO are anomalous, possibly to accommodate the low resolution.
- ^ a b c d Specifically cited in The Unicode Standard, Version 6.2. Miscellaneous Technical. Range: 2300–23FF.
- ^ In ISO 2047, ✠ is the primary glyph and ⊠ is only a fallback, but ECMA-17 lists only ⊠.
- ^ As a best-fit approximation ↖ could be used. Other defensible choices could be ⤺, ↰, ⮢, ⮪, ⮌ or ⮏.
- ^ a b c Primary Control Set of Data Syntax II of CCITT Rec. T.101, Comité Consultatif International Télégraphique et Téléphonique, 31 July 1987
International Interworking for Videotex Services » forpost » T101 » t101PDFe » t101p1.pdf, Terminals for Telematic Services, International Telecommunication Union, 11 November 1994 - ^ a b On the Teletype Model 33 TAPE and
TAPEwould control the tape punch, whereas XON and XOFF would control the reader. ENQ was labelled WRU for ‘who are you?’
Robert McConnell, James Haynes & Richard Warren, Understanding ASCII Codes, NADCOMM Papers and Writings, December 2002 - ^ Specifically cited in The Unicode Standard, Version 6.2. Control Pictures. Range: 2400–243F.
- ^ As a best-fit approximation ▨, 🮙 or ␥ could be used.
