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Command format
All commands except A/A/
A/
must begin with the prex AT, followed by the command letter, and must end with
the Enter key. Spaces are allowed in the command string to increase readability, but the modem ignores
them while executing a command. All commands may be typed in either uppercase or lowercase, but not in
mixed case. A command issued without a parameter is considered to have parameter “0”.
Examples: AA
A
TL[EntTL[Ent
TL[Ent
er]er]
er]
This command causes your modem to lower the volume from its speaker.
Refer to the following tables of AT commands and extended AT commands.
Table 3. Modem command list
Command
Description
Syntax
Values
ZZ
Z
Reset to default
conguration
ZZ
Z
+FCLASS+FCLASS
+FCLASS
Select Active Service
Class
+F+F
+F
CLCL
CL
ASAS
AS
SS
S
=<Mode> <Mode>
0: Select Data Mode
1: Select Facsimile Class 1
Mode
1.0: Select Facsimile Class 1.0
Mode
8: Select Voice Mode
+VCID+VCID
+VCID
Caller ID
+VC+VC
+VC
IDID
ID
=<pmode> <pmode>
0: Disable Caller ID reporting
1: Enables Caller ID with
formatted presentation to the
DTE.
2: Enables Caller ID with
unformatted presentation to the
DTE.
+VRID+VRID
+VRID
Report Retrieved Caller ID
+VRID+VRID
+VRID
=<pmode> <pmode>
0: Reports Caller ID with
formatted presentation to the
DTE.
1: Reports Caller ID with
unformatted presentation to the
DTE.
\N\N
\N
Operating Mode
\N\N
\N
<mode> <mode>
0: Selects normal speed
buffered mode (disables
error-correction mode)
and forces &Q6 (selects
asynchronous operation in
normal mode.)
1: Same as 0.
2: Selects reliable (error
correction) mode and forces
&Q5 (the modem will try to
negotiate an error corrected
link). The modem will rst
52 User Guide