Command And Response Characters - Iridium 9523 Developer's Manual

Iridium Communications, Inc.
Iridium 9523 Product Developers' Guide
Revision 2.6
Some extended commands incorporate set, read, and test modes. For example, AT–MSVTR is entered
as AT–MSVTR=n in set mode to enable/disable receipt of DTMF messages. It is entered as AT–
MSVTR? in read mode to query its current setting and is entered as AT–MSVTR=? in test mode to query
its range of valid settings.
Extended commands are grouped as shown below.
Extended Cellular Commands:

+C prefix

Used for GSM cellular phone-like functions

Standards: ETSI specifications GSM 07.07 [2] and GSM 07.05 [3]
Extended Data Compression Commands:

+D prefix

Used for data compression

Standard: V.25ter [1]
Extended Generic Commands:

+G prefix

Used for generic DCE issues such as identities and capabilities

Standard: V.25ter [1]
Extended Interface Control Commands:

+I prefix

Used to control the FA interface

Standard: V.25ter [1]
Extended Short Burst Data Commands:

+S prefix

Used for Short Burst Data messaging
Iridium Satellite Product Proprietary Commands:

–MS prefix

Proprietary to the Iridium product line

5.4 Command and Response Characters

The execution of a command string follows a left-to-right execution of each command followed by the
reporting of a result code for the entire string.
The ASCII character set (CCITT T.50 International Alphabet 5, American Standard Code for Information
Interchange) is used for the issuance of commands and responses. Only the low-order 7 bits of each
character are used for commands or parameters; the high-order bit is ignored. Upper case characters are
equivalent to lower case characters.
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