ASCII American Standard Code for Information Interchange

Control Codes

These are non printable characters that control the operation of the communication equipment:

Hex Dec Code Description Hex Dec Code Description
00 0 NUL Null 10 16 DLE Data Line Escape
01 1 SOH Start of Heading 11 17 DC1 X On
02 2 STX Start of Text 12 18 DC2 Aux On
03 3 ETX End of Text 13 19 DC3 X Off
04 4 EOT End of Transmit 14 20 DC4 Aux Off
05 5 ENQ Enquiry 15 21 NAK Negative Acknowledge
06 6 ACK Acknowledge 16 22 SYN Synchronous File
07 7 BEL Bell 17 23 ETB End of Transmitted Block
08 8 BS Backspace 18 24 CAN Cancel
09 9 HT Horizontal Tab 19 25 EM End of Medium
0A 10 LF Line Feed 1A 26 SUB Substitute
0B 11 VT Vertical Tab 1B 27 ESC Escape
0C 12 FF Form Feed 1C 28 FS File Separator
0D 13 CR Carriage Return 1D 29 GS Group Separator
0E 14 SO Shift Out 1E 30 RS Record Separator
0F 15 SI Shift In 1F 31 US Unit Separator

Text Codes

Hex Dec Code Hex Dec Code Hex Dec Code
20 32 Space 30 48 0 40 64 @
21 33 ! 31 49 1 41 65 A
22 34 “ 32 50 2 42 66 B
23 35 # 33 51 3 43 67 C
24 36 $ 34 52 4 44 68 D
25 37 % 35 53 5 45 69 E
26 38 & 36 54 6 46 70 F
27 39 ' 37 55 7 47 71 G
28 40 ( 38 56 8 48 72 H
29 41 ) 39 57 9 49 73 I
2A 42 * 3A 58 : 4A 74 J
2B 43 + 3B 59 ; 4B 75 K
2C 44 , 3C 60 < 4C 76 L
2D 45 - 3D 61 = 4D 77 M
2E 46 . 3E 62 > 4E 78 N
2F 47 / 3F 63 ? 4F 79 O
Hex Dec Code Hex Dec Code Hex Dec Code
50 80 P 60 96 ' 70 112 p
51 81 Q 61 97 a 71 113 q
52 82 R 62 98 b 72 114 r
53 83 S 63 99 c 73 115 s
54 84 T 64 100 d 74 116 t
55 85 U 65 101 e 75 117 u
56 86 V 66 102 f 76 118 v
57 87 W 67 103 g 77 119 w
58 88 X 68 104 h 78 120 x
59 89 Y 69 105 i 79 121 y
5A 90 Z 6A 106 j 7A 122 z
5B 91 [ 6B 107 k 7B 123 {
5C 92 \ 6C 108 l 7C 124 |
5D 93 ] 6D 109 m 7D 125 }
5E 94 ^ 6E 110 n 7E 126 ~
5F 95 _ 6F 111 o 7F 127 Del

Representation of the UK Pound sign '£' is not included in the ASCII set, the actual value used will depend upon the implementation.
Today, in the age of the World Wide Web a new set of codes is used where each character is represented by 2 bytes of data allowing representation of vast range of country specific characters.