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Iridium Communications, Inc.
Iridium 9523 Product Developers' Guide
Revision 2.6
5 AT Interface
5.1 Command Types
The Iridium 9523 employs two principal types of AT commands: basic and extended. The two types have
differing syntax used to query and adjust their settings. They also have unique reference standards.
A specific basic AT command is used to reference S-registers and query and adjust their settings. Its
syntax is similar to that of extended AT commands.
5.2 Basic Commands
Basic commands are industry standard and originally developed for Hayes-compatible PSTN modems. In
many cases, basic commands consist of a single ASCII alpha character.
In other cases, a special character precedes the alpha character. Prefix characters used in Iridium 9523
basic commands include &, \, %, and *.
Most alpha characters in basic commands are followed by a numeric parameter, n. To adjust its setting,
a basic command is entered with the appropriate numeric value of n. Note that if the numeric parameter
n is omitted from the basic command entry, a value of zero is assumed for n. For example, ATXn is set to
a value of 4 by entering ATX4, whereas it is set to value of 0 by entering either ATX0 or ATX.
To query a basic command setting, the AT&V command is entered to view the active configuration of a
group of basic commands.
Some basic commands listed in this document are marked with "No action, compatibility only". In these
cases, the basic command is accepted in the same fashion as is with other modems, but has no effect on
the operation of the Iridium 9523, since it has no meaning in the IridiumTM/SM environment.
5.3 Extended Commands
Extended commands perform actions or set parameters that extend the capability of the Iridium 9523
beyond that which is allowed by basic commands. In some cases, they were designed for non-PSTN
networks, such as the GSM network.
Most extended commands include a prefix of + followed by a single alpha character. Prefixes used in
Iridium 9523 extended commands include +C, +D, +G, +I, and +S. Extended commands designed
specifically for Iridium products include a –MS prefix.
Most extended commands include three alpha characters after the prefix, but some commands include
just one or two alpha characters after the prefix.
Some extended commands have a single execution mode. No further syntax is added after the prefix
and body of the command. For example, AT+GSN is entered as shown to query the Iridium 9523 for its
assigned serial number (i.e. IMEI).
Some extended commands incorporate a test mode to query their range of valid responses. For
example, AT+CBC is entered as shown in execution mode to query the Iridium 9523 for its battery
connection and charge status. The command is entered as AT+CBC=? in test mode to query its range of
valid responses.
Iridium Communications, Inc.
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