ANSI INCITS ISO 6936-1988 Information processing - Conversion between the two coded character sets of IS0 646 and IS0 6937-2 and the CCITT international telegraph alphabet No 2 (IT.pdf

1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION ME)KJJYHAPOAHAR OPrAHM3AI all other characters in the supplementary set shall be represented by the single character QUESTION MARK. The control characters of positions O/l, 0/2,0/3,0/4,

2、0/6, 1 IO, l/5, l/6, II7 and 7115 are generally not converted because they are removed from the character string by the link control equipment or by convention. Characters for which there are no direct equivalents shall be represented by the single character, QUESTION MARK, unless prior agreement ha

3、s been made between the interchange parties. NOTES 1 The greater number of code combinations available in IS0 545 or IS0 6937-2 means that not every character can be translated un- ambiguously into a single ITA 2 character. Use of a single character, rather than a multi-character representation will

4、 minimize formatting problems. 2 Annex A, together with table A.2, provides information on some alternative conversions which are in use in some countries. 1) CCITT Recommendation T.50 is equivalent to IS0 546. 2) CCITT Recommendation T.51 is equivalent to IS0 6937-2. ISO6936:1988 (E) Table 1 - Conv

5、ersion from ITA 2 to IS0 646 or IS0 6937-2 ITA 2 ITA 2 combination letter number shift l- IS0 646 or IS0 6937-2 Character” Coding Character” Coding 1 A A 4/l a 6/l 2 B B 412 b 612 3 C C 413 C 613 4 D D 414 d 614 5 E E 415 e 615 6 F F 416 f 616 7 G G 417 9 617 8 H H 418 h 618 9 I I 419 I 619 10 J J 4

6、110 i 6110 11 K K 4111 k 6111 12 L L 4112 I 6112 13 M M 4113 m 6113 14 N N 4114 n 6114 15 0 0 4115 0 6115 16 P P 5/o P 7/o 17 Q Q 5/l q 7/l 18 R R 512 r 712 19 S S 513 S 713 20 T T 514 t 714 21 U U 515 U 715 22 V V 516 ” 716 23 W W 517 w 717 24 X X 518 x 718 25 Y Y 519 Y 719 26 2 2 5110 z 7110 ITA 2

7、 IS0 646 or figure IS0 6937-2 shift character - ? WRU 3 National use National use National use 8 BELL 5 7 zz 2 6 + - ? ENQ*) 3 SUB SUB SUB 8 BEL ( ) IS0 646 or IS0 6937-2 coding 2113 3115 3110 015 313 l/l0 l/l0 l/l0 318 o/7 218 219 2114 2112 319 3/o 3/l 314 217 315 317 3113 312 2115 316 2111 ITA 2 T

8、 ITA 2 character IS0 646 or IS0 6937-2 IS0 646 or IS0 6937-2 combination number (either shift) character coding 27 CARRIAGE RETURN CR O/13 28 LINE FEED LF 29 LETTER SHIFT (See note 3) 30 FIGURE SHIFT (See note 3) 31 SPACE SP 32 NU (not normallv used) NUL 0110 2/o o/o 1) Small or capital letters may

9、be used, however intermixing of small and capital letters is not allowed. 2) This character is used only to operate the answer-back unit of the corresponding instrument in the International Public Services. 3) These characters have no corresponding function in IS0 646 or IS0 6937-2. Conversion equip

10、ment operates the appropriate shift and discards the characters. IS0 6936 : 1988 (E) 0 1 2 3 4 5 6 7 8 9 IO 11 12 13 14 15 Table 2 - Conversion from IS0 646 or IS0 6937-2 to ITA 2 0 1 2 3 4 5 6 7 I IS0 646 or NOTES 1 Characters allocated to LETTER SHIFT or FIGURE SHIFT are specified in table 1. If t

11、he last shift that occurred differs from the next one required, it is essential for the converted character to be preceded by the appropriate shift character. This operation is necessary each time a change of shift is required. 2 For position O/O, see A.4. 3 For positions 213 and 214 in IS0 646, see

12、 4.3.2 in IS0 646. 3 IS0 6936 : 1966 (El Annex A (informative) Alternative conversions between IS0 646 and ITA 2 A.1 This International Standard (see note to 3.1 and note 2 to 3.2) permits alternative conversions for characters which have no direct equivalents, provided these conversions are agreed

13、between interchange parties. Other alternatives may be used. A.2 Tables A.1 and A.2 list conversions which are in use in some countries. A.3 In some nationally adapted applications of ITA 2 and IS0 646 specified conversion rules are required because national characters have been allocated in differe

14、nt order in the coded character sets concerned. A.4 NUL is equivalent to “all space” (combination 32 or NU) in ITA 2. Table A.1 - Examples of alternative conversions from ITA 2 to IS0 646 ITA 2 I IS0 646 (IRV) Shift Combination number Character Character Coding Remarks a) Figure 6 5111 Figure 7 Nati

15、onal use 5112 See clause A.3 Figure 8 5113 b) Figure 6 7111 Figure 7 National use 7112 Se clause A.3 Figure 8 7113 cl Either Either 29 LETTER SHIFT IS2 l/14 30 FIGURE SHIFT I IS1 l/l5 I d) Either Either 29 LETTER SHIFT I DEL I 7115 30 FIGURE SHIFT DEL 7115 I I e) as d) but with additional agreement

16、that only shift characters following the first one are converted to 7/15. The first one is treated according to table 1 in the body of this International Standard. I IS0 6936 : 1996 (El Table A.2 - Examples of alternative conversions from IS0 646 and ITA 2 IS0 646 (IRVI ITA 2 Remarks Coding Characte

17、r Characters Combination number O/l SOH (in figure shift) o/2 STX o/3 ETX o/4 EOT 12 (RIGHT PARENTHESIS) These conversions are alternatives where O/6 ACK I?) 2 (QUESTION MARK) characters are not removed from the l/l DLE 12 (RIGHT PARENTHESIS) character string by the link control equip- l/5 NAK ment

18、or by convention. l/6 SYN l/7 ETB 018 BS (in figure shift) o/s HT o/11 VT o/12 FF o/14 so o/15 SI l/l DC1 12 (RIGHT PARENTHESIS) Representation by other sequences will l/2 DC2 2 (QUESTION MARK) be dealt with by another International l/3 DC3 I?) 12 (RIGHT PARENTHESIS) Standard. l/4 DC4 l/8 CAN l/S EM

19、 l/10 SUB l/11 ESC l/12 IS4 l/13 IS3 l/14 IS2 LETTER SHIFT 29 See also table 3. l/l5 IS1 FIGURE SHIFT 30 29 and 30 may be used with either shift. 7115 DEL LETTER SHIFT 29 2/l ! (in figure shift) 212 I, 213 # (f) 214 u ($1 215 % 2/6 & 2110 * 3111 I 3112 (?I 12 (RIGHT PARENTHESIS) Standard. 4/o 5114 A

20、 5115 6/O 7111 7112 I 7113 1 7114 5111 5112 5113 7111 7112 7113 fin figure shift) I 6 National use options 7 See clause A.3 1 8 tin figure shift) l 6 I National use options 7 See clause A.3 1 8 _I_ _I._, . . t- use OT NtVV LlNt requrres aaamonar agreemenr oetween me rnrercnange partres. 5 IS0 6936 : 1988 (E) UDC 681.3.05 Descriptors : data processing, information interchange, character sets, coded character sets, coded representation, IS0 seven-bit codes, alphabets. Price based on 5 pages