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ASCII Codes

ASCII (pronounced as as'-key) is the acronym for American Standard Code For Information Interchange. ASCII is a character set and character encoding based on the English alphabet. This chart and its definitions are based on RFC 20.
For Extended ASCII Codes, see: Extended ASCII Codes.

CC: Communication Control; FE: Format Effector; IS: Information Separator.

DecHexCharDescription
00NULNull
11SOHCC: Start of Heading
22STXCC: Start of Text
33ETXCC: End of Text
44EOTCC: End of Transmission
55ENQCC: Enquiry
66ACKCC: Acknowledge
77BELBell (audible or attention signal)
88BSFE: Backspace
99HTFE: Horizontal Tabulation (punched card skip)
10ALFFE: Line Feed
11BVTFE: Vertical Tabulation
12CFFFE: Form Feed
13DCRFE: Carriage Return
14ESOShift Out
15FSIShift In
1610DLECC: Data Link Exchange
1711DC1Device Control 1
1812DC2Device Control 2
1913DC3Device Control 3
2014DC4Device Control 4 (Stop)
2115NAKCC: Negative Acknowledge
2216SYNCC: Synchronous Idle
2317ETBCC: End of Transmission
2418CANCancel
2519EMEnd of Medium
261ASUBSubstitute
271BESCEscape
281CFSIS: File Separator
291DGSIS: Group Separator
301ERSIS: Record Separator
311FUSIS: Unit Separator
3220 Space (normally non-printing)
3321!Exclamation Point
3422"Quotation Marks
3523#Number Sign
3624$Dollar Sign
3725%Percent
3826&Ampersand
3927'Apostrophe
4028(Opening Parenthesis
4129)Closing Parenthesis
422A*Asterisk
432B+Plus
442C,Comma
452D-Hyphen (Minus)
462E.Period (Decimal Point)
472F/Slant
48300Number 0
49311Number 1
50322Number 2
51333Number 3
52344Number 4
53355Number 5
54366Number 6
55377Number 7
56388Number 8
57399Number 9
583A:Colon
593B;Semicolon
603C<Less Than
613D=Equals
623E>Greater Than
633F?Question Mark
6440@Commercial At
6541ALetter A
6642BLetter B
6743CLetter C
6844DLetter D
6945ELetter E
7046FLetter F
7147GLetter G
7248HLetter H
7349ILetter I
744AJLetter J
754BKLetter K
764CLLetter L
774DMLetter M
784ENLetter N
794FOLetter O
8050PLetter P
8151QLetter Q
8252RLetter R
8353SLetter S
8454TLetter T
8555ULetter U
8656VLetter V
8757WLetter W
8858XLetter X
8959YLetter Y
905AZLetter Z
915B[Opening Bracket
925C\Reverse Slant
935D]Closing Bracket
945E^Circumflex
955F_Underline
9660`Grave Accent
9761aLetter a
9862bLetter b
9963cLetter c
10064dLetter d
10165eLetter e
10266fLetter f
10367gLetter g
10468hLetter h
10569iLetter i
1066AjLetter j
1076BkLetter k
1086ClLetter l
1096DmLetter m
1106EnLetter n
1116FoLetter o
11270pLetter p
11371qLetter q
11472rLetter r
11573sLetter s
11674tLetter t
11775uLetter u
11876vLetter v
11977wLetter w
12078xLetter x
12179yLetter y
1227AzLetter z
1237B{Opening Brace
1247C|Vertical Line
1257D}Closing Brace
1267E~Overline (Tilde)
1277FDELDelete

Definitions:

CharDefinition
CCCommunication Control: A functional character intended to control or facilitate transmission of information over communication networks.
FEFormat Effector: A functional character which controls the layout or positioning of information in printing or display devices.
ISInformation Separator: A character which is used to separate and qualify information in a logical sense. There is a group of four such characters, which are to be used in a hierarchical order.
NULNull: The all-zeros character which may serve to accomplish time fill and media fill.
SOHStart of Heading: A communication control character used at the beginning of a sequence of characters which constitute a machine-sensible address or routing information. Such a sequence is referred to as the "heading." An STX character has the effect of terminating a heading.
STXStart of Text: A communication control character which precedes a sequence of characters that is to be treated as an entity and entirely transmitted through to the ultimate destination. Such a sequence is referred to as "text." STX may be used to terminate a sequence of characters started by SOH.
ETXEnd of Text: A communication control character used to terminate a sequence of characters started with STX and transmitted as an entity.
EOTEnd of Transmission: A communication control character used to indicate the conclusion of a transmission, which may have contained one or more texts and any associated headings.
ENQEnquiry: A communication control character used in data communication systems as a request for a response from a remote station. It may be used as a "Who Are You" (WRU) to obtain identification, or may be used to obtain station status, or both.
ACKAcknowledge: A communication control character transmitted by a receiver as an affirmative response to a sender.
BELBell: A character for use when there is a need to call for human attention. It may control alarm or attention devices.
BSBackspace: A format effector which controls the movement of the printing position one printing space backward on the same printing line. (Applicable also to display devices.)
HTHorizontal Tabulation: A format effector which controls the movement of the printing position to the next in a series of predetermined positions along the printing line. (Applicable also to display devices and the skip function on punched cards.)
LFLine Feed: A format effector which controls the movement of the printing position to the next printing line. (Applicable also to display devices.) Where appropriate, this character may have the meaning "New Line" (NL), a format effector which controls the movement of the printing point to the first printing position on the next printing line. Use of this convention requires agreement between sender and recipient of data.
VTVertical Tabulation: A format effector which controls the movement of the printing position to the next in a series of predetermined printing lines. (Applicable also to display devices.)
FFForm Feed: A format effector which controls the movement of the printing position to the first pre-determined printing line on the next form or page. (Applicable also to display devices.)
CRCarriage Return: A format effector which controls the movement of the printing position to the first printing position on the same printing line. (Applicable also to display devices.)
SOShift Out: A control character indicating that the code combinations which follow shall be interpreted as outside of the character set of the standard code table until a Shift In character is reached.
SIShift In: A control character indicating that the code combinations which follow shall be interpreted according to the standard code table.
DLEData Link Escape: A communication control character which will change the meaning of a limited number of contiguously following characters. It is used exclusively to provide supplementary controls in data communication networks.
DC1-4Device Controls: Characters for the control of ancillary devices associated with data processing or telecommunication systems, more especially switching devices "on" or "off." (If a single "stop" control is required to interrupt or turn off ancillary devices, DC4 is the preferred assignment.)
NAKNegative Acknowledge: A communication control character transmitted by a receiver as a negative response to the sender.
SYNSynchronous Idle: A communication control character used by a synchronous transmission system in the absence of any other character to provide a signal from which synchronism may be achieved or retained.
ETBEnd of Transmission Block: A communication control character used to indicate the end of a block of data for communication purposes. ETB is used for blocking data where the block structure is not necessarily related to the processing format.
CANCancel: A control character used to indicate that the data with which it is sent is in error or is to be disregarded.
EMEnd of Medium: A control character associated with the sent data which may be used to identify the physical end of the medium, or the end of the used, or wanted, portion of information recorded on a medium. (The position of this character does not necessarily correspond to the physical end of the medium.)
SUBSubstitute: A character that may be substituted for a character which is determined to be invalid or in error.
ESCEscape: A control character intended to provide code extension (supplementary characters) in general information interchange. The Escape character itself is a prefix affecting the interpretation of a limited number of contiguously following characters.
FS, GS, RS, USFile Separator, Group Separator, Record Separator, and Unit Separator: These information separators may be used within data in optional fashion, except that their hierarchical relationship shall be: FS is the most inclusive, then GS, then RS, and US is least inclusive. (The content and length of a File, Group, Record, or Unit are not specified.)
DELDelete: This character is used primarily to "erase" or "obliterate" erroneous or unwanted characters in perforated tape. (In the strict sense, DEL is not a control character.)


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