ASCII - The American Standard Code for Information Interchange
 

ASCII - The American Standard Code for Information Interchange

 

The American National Standards Institute has published an American Standards Code for Information Interchange(ASCII)

This code is now most widely used by major manufactures. so that their equipment will be compatible with those of other manufactures.

 

ASCII is a computer code which uses 128 different coding combinations of a group of seven bits (27= 128) to represent


  • Characters A to Z, both upper and lower case
  • Special characters, < , ., ?, : ,etc.,
  • Numbers 0 to 9
  • Special control codes used in device control

 

 

 

Example Code the text string 'Hello.' in ASCII using hexadecimal digits.
    H = 48 
    e  = 65
    l   = 6C 
    l   = 6C 
    o  = 6F
    .   = 2E

 

Thus the string is represented by the byte sequence   
  48 65 6C 6C 6F 2E

 

ASCII Code Chart























































































































































































































































































































































































































































































































































































HEX DEC CHR CTRL   HEX DEC CHR   HEX DEC CHR   HEX DEC CHR
00 0 NUL ^@   20 32 SP   40 64 @   60 96 `
01 1 SOH ^A   21 33 !   41 65 A   61 97 a
02 2 STX ^B   22 34 "   42 66 B   62 98 b
03 3 ETX ^C   23 35 #   43 67 C   63 99 c
04 4 EOT ^D   24 36 $   44 68 D   64 100 d
05 5 ENQ ^E   25 37 %   45 69 E   65 101 e
06 6 ACK ^F   26 38 &   46 70 F   66 102 f
07 7 BEL ^G   27 39 '   47 71 G   67 103 g
08 8 BS ^H   28 40 (   48 72 H   68 104 h
09 9 HT ^I   29 41 )   49 73 I   69 105 i
0A 10 LF ^J   2A 42 *   4A 74 J   6A 106 j
0B 11 VT ^K   2B 43 +   4B 75 K   6B 107 k
0C 12 FF ^L   2C 44 ,   4C 76 L   6C 108 l
0D 13 CR ^M   2D 45 -   4D 77 M   6D 109 m
0E 14 SO ^N   2E 46 .   4E 78 N   6E 110 n
0F 15 SI ^O   2F 47 /   4F 79 O   6F 111 o
10 16 DLE ^P   30 48 0   50 80 P   70 112 p
11 17 DC1 ^Q   31 49 1   51 81 Q   71 113 q
12 18 DC2 ^R   32 50 2   52 82 R   72 114 r
13 19 DC3 ^S   33 51 3   53 83 S   73 115 s
14 20 DC4 ^T   34 52 4   54 84 T   74 116 t
15 21 NAK ^U   35 53 5   55 85 U   75 117 u
16 22 SYN ^V   36 54 6   56 86 V   76 118 v
17 23 ETB ^W   37 55 7   57 87 W   77 119 w
18 24 CAN ^X   38 56 8   58 88 X   78 120 x
19 25 EM ^Y   39 57 9   59 89 Y   79 121 y
1A 26 SUB ^Z   3A 58 :   5A 90 Z   7A 122 z
1B 27 ESC     3B 59 ;   5B 91 [   7B 123 {
1C 28 FS     3C 60 <   5C 92 \   7C 124 |
1D 29 GS     3D 61 =   5D 93 ]   7D 125 }
1E 30 RS     3E 62 >   5E 94 ^   7E 126 ~
1F 31 US     3F 63 ?   5F 95 _   7F 127 DEL

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