NAL Research Corporation (451-93156-002A)
18
+D prefix
Used for data compression
Standard: V.25ter [1]
Extended Generic Commands:
+G prefix
Used for A3LA-RM issues such as identities and capabilities
Standard: V.25ter [1]
Extended Interface Control Commands:
+I prefix
Used to control the DTE 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
A.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.
A.5 Command Entry
An AT command is a string of characters sent by the DTE to the A3LA-RM while it is in command mode.
A command string has a prefix, a body, and a terminator. The prefix consists of the ASCII characters AT or
at. The body is a string of commands restricted to printable ASCII characters. The default terminator is the
<CR> character. AT command entry syntax is critical, and the following rules apply:
All commands (apart from A/ and +++) begin with a prefix of AT or at.
The commands in a command string (apart from A/ and +++) are executed only after the
return or enter key is pressed.
Use of upper or lower case letters is allowed.
The maximum number of characters in a command string is 128.
If the numeric parameter n is omitted from the basic command entry, a value of zero is
assumed for n.
If an optional parameter is omitted from an extended command, the current value is implied.
Optional parameters are enclosed by square brackets ([...]) in this document.
