3: Command Reference
3
• Introduction
• Command Types
• Command Reference
• Result Codes
• Factory Default
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.25
ter
(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.42
bis
data
compression
•
GPRS packet data service
•
EDGE packet data service
Rev 3.2 Oct.05
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