Table 4: AT Command Set Summary. The following table is from Lucent Technologies,
Host-Based Controller Modem AT Command Set, Version 1.1, June 15, 1998.
Command
Description
Command
Description
M
Monitor speaker mode \A
MNP block size
N
Modulation
handshake
\B
Send break
O
Return to online data
\G
Modem port flow control
P
Select pulse dialing
\J
Adjust bits/s rate control
Q
Result code control
\K
Set break control
T
Select tone dialing
\N
Error control mode selection
V
DCE response format
\Q
Local flow control selection
W
Result code option
\R
Ring indicator off after answer
X
Result code selection
and call progress
monitoring
\T
Inactivity timer
Y
Long-space disconnect \V
Protocol result code
Z
Reset and recall stored
profile
\X
XON/OFF pass through
&B
V.32 auto retrain
%B
View numbers in blacklist
&C
Data carrier detect
(DCD) control
%C
Data compression control
&D
Data terminal ready
(DTR
%E
Automatic rate change
&F
Local factory settings
-C
Data calling tone
&G
V.22bis guard tone
control
-V90
Enable/disable V.90 settings
Table 5: The S-Register Summary. The S-registers 42 and 43 are for testing and
debugging purposes only.
Register
Default
Description
S0
0
Automatic answer ring number
S1
0
Ring counter
S2
43
AT escape character
S3
13
Command line termination character
S4
10
Response formatting character
S5
8
Command line editing character
S6
2
Wait before dialing
S7
50
Connection completion time-out
S8
2
Comma dial modifier time
Appendix B. Modem function
B-3
