AL3A-RM User Guide Version B
Document Number: 451-93156-002B
37 of 172
Extended Short Burst Data Commands
:
+S prefix
Used for SBD messaging
Iridium Satellite Product Proprietary Commands
:
–MS prefix
Proprietary to the Iridium product line
12.4
C
OMMAND AND
R
ESPONSE
C
HARACTERS
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. Uppercase characters are equivalent to
lowercase characters.
12.5
C
OMMAND
E
NTRY
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 uppercase or lowercase 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.
