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ASCII Code Summary
ASCII Code Details
Decimal Values 00 to 31 – ACG & UCG Descriptions
Dec
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
NetScan User's Manual
Name
Null (
NUL
)
Start of Header (
)
SOH
Start of Text (
STX
)
End of Text (
ETX
)
End of Transmission (
)
EOT
Inquiry (
ENQ
)
Acknowledgement (
ACK
)
Bell (
BEL
)
Backspace (
BS
)
Horizontal Tab (
)
HT
Line Feed (
LF
)
Vertical Tab (
VT
)
Form Feed (
)
FF
Carriage Return (
CR
)
Shift Out (
SO
)
Shift In (
SI
)
Data Link Escape (
DLE
)
Device Control 1 (
DC1
)
Device Control 2 (
DC2
)
Device Control 3 (
DC3
)
Device Control 4 (
)
DC4
Negative Acknowledgement (
Synchronous Idle (
)
SYN
End of Transmission Block (
ETB
Cancel (
CAN
)
End of Medium (
)
EM
Substitute (
SUB
)
Escape (
ESC
)
File Separator (
)
FS
Group Separator (
GS
)
Record Separator (
RS
)
Unit Separator (
)
US
ASCII Control Codes (00 to 31)
Description
Space filler character. Used in output timing for some device
drivers.
Marks beginning of message header.
Marks beginning of data block (text).
Marks end of data block (text).
Marks end of transmission session.
Request for identification or information.
"Yes" answer to questions or "ready for next transmission." Used in
asynchronous protocols for timing.
Rings bell or audible alarm on terminal.
Moves cursor position back one character.
Moves cursor position to next tab stop on line.
Moves cursor position down one line.
Moves cursor position down to next "tab line."
Moves cursor position to top of next page.
Moves cursor to left margin.
Next characters do not follow ASCII definitions.
Next characters revert to ASCII meaning.
Used to control transmissions using "escape sequences."
Not defined. Normally used for ON controls.
Usually user-defined.
Not defined. Normally used for OFF controls.
Usually user-defined.
NAK
)
"No" answer to questions or "errors found, re-transmit." Used in
asynchronous protocols for timing.
Sent by asynchronous devices when idle to insure sync.
)
Marks block boundaries in transmission.
Indicates previous transmission should be disregarded.
Marks end of physical media, as in paper tape.
Used to replace a character known to be wrong.
Marks beginning of an Escape control sequence.
Marker for major portion of transmission.
Marker for submajor portion of transmission.
Marker for minor portion of transmission.
Marker for most minor portion of transmission.
Appendix F
F-3
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