ASCII-(AMERICAN STANDARD CODE FOR INFORMATION INTERCHANGE)

※ ASCII is the abbreviation of American Standard Code Information Interchange.It is a universally accepted alphanumeric (character) code.

※ It is used in most computers and other electronic equipment.Most computer keyboards are standardized with ASCII. When we press a key, the corresponding ASCII code is generated which goes into the computer.

※ASCII has 128 character and symbols. We need  7 bits to represent 128 character.So ASCII  is a 7 bit code.

※ It can be considered as an 8 bit code with MSB=0 always.

※This 8 bit code is 00 through 7F in Hexadecimal.

※ The first thirty -two ASCII character are nongraphic commands which are never printed or displayed. They are used only for the control purpose.

※Examples of control characters are "line feed" or "null" or "escape" etc.

※The remaining characters are graphic symbols which can be displayed or printed. This includes the letters of alphabets, ten decimal digits, punctuation signs and other commonly used symbols.

※The ASCII code set consists of 94 printable characters, SPACE and DELETE characters, and 32 control symbols. This is shown in table:-

DECIMAL NO.	HEX NO.	CHAR	DESCRIPTION
0	0	NUL	[NULL]
1	1	SOH	[START OF HEADING]
2	2	STX	[START OF TEXT]
3	3	ETX	[END OF TEXT]
4	4	EOT	[END OF TRANSMISSION]
5	5	ENQ	[ENQUIRY]
6	6	ACK	[ACKNOWLEDGE]
7	7	BEL	[BELL]
8	8	BS	[BACKSPACE]
9	9	HT	[HORIZONTAL TAB]
10	A	LF	[LINE FEED]
11	B	VT	[VERTICAL TAB]
12	C	FF	[FORM FEED]
13	D	CR	[CARRIGE RETURN]
14	E	SO	[SHIFT OUT]
15	F	SI	[SHIFT IN]
16	10	DLE	[DATA LINK ESCAPE]
17	11	DC1	[DEVICE CONTROL 1]
18	12	DC2	[DEVICE CONTROL 2]
19	13	DC3	[DEVICE CONTROL 3]
20	14	DC4	[DEVICE CONTROL 4]
21	15	NAK	[NEGATIVE ACKNOWLEDGE]
22	16	SYN	[SYNCHRONOUS IDLE]
23	17	ETB	[END OF TRANSMISSION BLOCK]
24	18	CAN	[CANCEL]
25	19	EM	[END OF MEDIUM]
26	1A	SUB	[SUBSTITUTE]
27	1B	ESC	[ESCAPE]
28	1C	FS	[FILE SEPARATOR]
29	1D	GS	[GROUP SEPARATOR]
30	1E	RS	[RECORD SEPARATOR]
31	1F	US	[UNIT SEPARATOR]
32	20	Space	[SPACE]
33	21	!	[EXCALMATION MARK]
34	22	"	[DOUBLE QUOTE]
35	23	#	[NUMBER]
36	24	$	[DOLLAR]
37	25	%	[PERCENT]
38	26	&	[AMPERSAND]
39	27	'	[SINGLE QUOTE]
40	28	(	[LEFT PARENTHESIS]
41	29	)	[RIGHT PARENTHESIS]
42	2A	*	[ASTERISK]
43	2B	+	[PLUS]
44	2C	,	[COMMA]
45	2D	-	[MINUS]
46	2E	.	[PERIOD]
47	2F	/	[SLASH]
48	30	0
49	31	1
50	32	2
51	33	3
52	34	4
53	35	5
54	36	6
55	37	7
56	38	8
57	39	9
58	3A	:	[COLON]
59	3B	;	[SEMICOLON]
60	3C	<	[LESS THAN]
61	3D	=	[EQUALITY SIGN]
62	3E	>	[GREATER THAN]
63	3F	?	[QUESTION MARK]
64	40	@	[AT SIGN]
62	3E	>	[GREATER THAN]
63	3F	?	[QUESTION MARK]
64	40	@	[AT SIGN]
65	41	A
66	42	B
67	43	C
68	44	D
69	45	E
70	46	F
71	47	G
72	48	H
73	49	I
74	4A	J
75	4B	K
76	4C	L
77	4D	M
78	4E	N
79	4F	O
80	50	P
81	51	Q
82	52	R
83	53	S
84	54	T
85	55	U
86	56	V
87	57	W
88	58	X
89	59	Y
90	5A	Z
91	5B	[	[LEFT SQUARE BRACKET]
92	5C	\	[BACKSLASH]
93	5D	]	[RIGHT SQUARE BRACKET]
94	5E	^	[CARET/CIRCUMFLEX]
95	5F	_	[UNDERSCORE]
96	60	`	[GRAVE/ACCENT]
97	61	a
98	62	b
99	63	c
100	64	d
101	65	e
102	66	f
103	67	g
104	68	h
105	69	i
106	6A	j
107	6B	k
108	6C	l
109	6D	m
110	6E	n
111	6F	o
112	70	p
113	71	q
114	72	r
115	73	s
116	74	t
117	75	u
118	76	v
119	77	w
120	78	x
121	79	y
122	7A	z
123	7B	{	[LEFT CURLY BRACKET]
124	7C	|	[VERTICAL BAR]
125	7D	}	[RIGHT CURLY BRACKET]
126	7E	~	[TILDE]
127	7F	DEL	[DELETE]