Velocity Edge GX440 Specifications download pdf (Page 25)

3: Command Reference

• Introduction

• Command Types

• Command Reference

Table

• Result Codes

• Factory Default

Settings

Note: Not every GSM/GPRS

product supports all commands.

Introduction

As described in the previous section, AT commands are

available with Sierra Wireless GSM products for users of the

COM serial interface. The commands allow control of Circuit

Switched Data (CSD) calls and data exchange, similar to dial-

up modems, but without wires, and with additional

commands available specific to GSM, GPRS, and EDGE.

The AT command set has grown from the original set used

with Hayes™ landline modems to support wireless connec-

tions and is now standardized by the Third Generation

Partnership Project (3GPP). The commands are defined in the

standards known as V.25ter (for standard modem commands),

GSM 07.07 (for GSM and GPRS) and GSM 07.05 (for text

messaging, also known as short message service—SMS). The

following sections describe those commands.

AT commands conform by default to the Phase 2 specifications

for GSM 07.07 and GSM 07.05. Some AT commands have been

implemented according to Phase 2+ in order to support

extended features, such as 14.4 kbps CSD connections.

The AT commands provide the following features for Sierra

Wireless GSM devices:

• Voice service

• Short Message Service (SMS)

• Circuit switched data service (CSD), including V.42bis data

compression

• GPRS packet data service

• EDGE packet data service

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Velocity Edge GX440 Specifications Page 25