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ASCII Code Summary
Decimal Values 00 to 31 – ACG & UCG Descriptions
Dec
Addressed Command Group (
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Universal Command Group (
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
F-4
Name
ACG
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
)
UCG
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.
)
"No" answer to questions or "errors found, re-transmit." Used in
NAK
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
ChartScan User's Manual
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