RC224ATL View Datasheet(PDF) - Conexant Systems

Part Name

Description

MFG CO.

RC224ATL

Embedded Modem Family

Conexant Systems 

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4.0 AT Commands

RC224ATL/224ATLV

EmbeddedModem Family

Table 4-2. AT Command Set Summary (1 of 5)

Command

Function

Default

Parameters/Description

A/

Re-execute command

—

—

A

Answer a call

—

—

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

n=1

n = 0 Selects CCITT operation at 300 or 1200 bps during Call

Establishment and a subsequent connection.

Parameters: n = 0,1

n = 1 Selects BELL operation at 300 or 1200 bps during Call

Establishment and a subsequent connection.

Cn

Carrier control

n=1

—

Parameters: n = 0,1

D

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

Dial modifier

—

—

En

Command echo

Parameters: n = 0,1

n=1

n = 0 Disables command echo.

n = 1 Enables command echo.

Fn

On-line character echo option n = 1

n = 0 Returns ERROR result code.

Parameters: n = 0,1

n = 1 Returns OK result code.

Hn

Disconnect (hang-up)

n=0

n = 0 Modem on-hook (relay open).

Parameters: n = 0,1

n = 1 Modem off-hook (relay closed).

In

Identification

n=0

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

n=2

n = 0 Low volume.

Parameters: n = 0,1,2,3

n = 1 Low volume.

n = 2 Medium volume.

n = 3 High volume.

Mn

Speaker control

n=1

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

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