4.0 AT Commands
RC224ATL/224ATLV
EmbeddedModem Family
Table 4-2. AT Command Set Summary (1 of 5)
Command
A/
Function
Default
Parameters/Description
Re-execute command
Answer a call
—
—
—
—
—
A
AT
Command line prefix
Parameters: none
Attention Code. Precedes the command line except for +++
(escape) and A/ (repeat) commands.
Bn
Select CCITT or Bell Mode
Parameters: n = 0,1
n = 1
n = 0 Selects CCITT operation at 300 or 1200 bps during Call
Establishment and a subsequent connection.
n = 1 Selects BELL operation at 300 or 1200 bps during Call
Establishment and a subsequent connection.
Cn
D
Carrier control
Parameters: n = 0,1
n = 1
—
—
Dial Command. D causes the modem to dial the number which
follows the D in the command line. Valid dial characteristics are 0
to 9, A to D, #, and *. Other valid dial modifier characters are “,”
P, R, S=n, T, W, “;”, @, and !.
—
Dn
En
Dial modifier
—
—
Command echo
Parameters: n = 0,1
n = 1
n = 0 Disables command echo.
n = 1 Enables command echo.
Fn
Hn
In
On-line character echo option
Parameters: n = 0,1
n = 1
n = 0
n = 0
n = 0 Returns ERROR result code.
n = 1 Returns OK result code.
Disconnect (hang-up)
Parameters: n = 0,1
n = 0 Modem on-hook (relay open).
n = 1 Modem off-hook (relay closed).
Identification
n = 0 Reports product identification code.
n = 1 Calculates the ROM checksum.
Parameters: n = 0,1,2,3
n = 2 Calculates the ROM checksum and compares it with the
prestored checksum. Reports "OK" if the calculated
checksum equals the prestored checksum or if the
prestored checksum value is FFh; otherwise reports
“ERROR”.
n = 3 Reports the firmware version and ROM part number.
Ln
Speaker volume
Parameters: n = 0,1,2,3
n = 2
n = 1
n = 0 Low volume.
n = 1 Low volume.
n = 2 Medium volume.
n = 3 High volume.
Mn
Speaker control
n = 0 Speaker is always off.
Parameters: n = 0,1,2,3
n = 1 Speaker is on during Call Establishment, but off when
receiving carrier.
n = 2 Speaker is always on.
n = 3 Speaker is on after dialing, until carrier is detected.
On
Go on-line
Parameters: n = 0,1
—
n = 0 On-line state.
n = 1 On-line state with equalizer retrain.
P
Force pulse dialing
—
—
Qn
Quiet Result codes control
n = 0
n = 0 Enables result codes to the DTE.
n = 1 Disables result codes to the DTE.
4-2
Conexant
D224ATLVDSC
CONEXANT [ CONEXANT SYSTEMS, INC ]
