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Chapter 2 – AT Commands Overview

Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C) 8

Chapter 2 – AT Commands

Overview

Serial Interface Settings

A modem serial interface is set with the following default values (factory settings):

115,200bps

8 bits data

1 stop bit

no parity

RTS/CTS flow control.

Note: Some models may have a different value for the default baud rate.

The +IPR, +IFC and +ICF commands can be used to change these settings, if required. Changes made using

these commands become effective immediately following the transmission of the successful command result

(OK).

Overview

AT commands are commonly used to communicate with modem equipment. The modem provides an AT

command interface over the serial link between the modem and a host application. The format of an AT command

is an ASCII string that always starts with “AT” and ends with a defined set of characters. The format is defined in

detail later in this chapter.

AT command communication between the host application and the modem is blocking: the host application must

wait for the completion of one command before issuing the next command. The behavior of the modem is

undefined if a new command is issued before the previous command’s result code is returned.

While AT command communication is generally host-driven, unsolicited responses may also be sent to the host

application when a certain events occur. Host applications should be prepared to receive unsolicited responses

from the modem at any time except during AT command entry.

AT+CREG=0<CR> Unsolicited response cannot occur between the ‘A’ and <CR>

<CR><LF> Unsolicited response will not occur here unless otherwise documented

OK<CR><LF> Unsolicited response can occur here

Wavecom supports only the AT commands listed in this document. Other AT commands may be functional as a

result of the baseline code, but they will not be supported by Wavecom. The status of undocumented commands

should not be assumed. It is recommended that only the listed AT commands be used in a host application.

Note: The test command option associated with AT commands may also be present for a large percentage of the

AT commands.

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