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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
Note:
126
Appendix
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
(1) ASCII control codes are sometimes used to "formalize" a communications session
between communication devices. (2)
have user-defined meanings, and may vary in use between sessions or devices. (3)
often used as a general "stop transmission character." (4) Codes used to control cursor
position may be used to control print devices, and move the print head accordingly. However,
not all devices support the full set of positioning codes.
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.
DC1, DC2, DC3, DC4, FS, GS, RS,
Personal488 User's Manual For Windows95 and Windows NT
and
all
US
is
DC4
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