User's Manual

Iridium Satellite LLC
9601 Transceiver –AT Command Reference
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Information contained herein is preliminary and subject to change without further notice
This command is used to transfer a binary SBD message from the single mobile
terminated buffer in the 9601 to the DTE. The mobile terminated buffer can contain
only one message at any one time.
 The SBD message is transferred formatted as follows:
{2-byte message length} + {binary SBD message} + {2-byte checksum}
 The {2-byte message length} field represents the length, in bytes, of the
SBD message not including the length field or the mandatory two-byte
checksum. The high order byte will be sent first.
 The maximum mobile terminated SBD message length is length is specified
at 135 bytes (and may be increased following actual performance testing).
 The checksum is the least significant 2-bytes of the summation of the entire
SBD message. The high order byte will be sent first. For example if the
9601 were to send the word “hello” encoded in ASCII to the DTE the binary
stream would be hex 00 05 68 65 6c 6c 6f 02 14.
 If there is no mobile terminated SBD message waiting to be retrieved from
the 9601, the message length and checksum fields will be zero.
 The mobile terminated message buffer will be empty upon power-up.
Command Response:
There are no response codes generated by the 9601 for this command.
2.31 +SBDWT –Short Burst Data: Write a Text Message to the Module
Exec Command: +SBDWT[=<text message>]
This command is used to transfer a text SBD message from the DTE to the single
mobile originated buffer in the 9601.
The text message may be entered on the command line:
 For example, “AT+SBDWT=hello”.
 The length of <text message> is limited to 120 characters. This is due to the
length limit on the AT command line interface.
 The message is terminated when a carriage return is entered.
Alternatively, the text message may entered separately:
 Upon entering the command “AT+SBDWT”, the 9601 will indicate to the DTE that
it is prepared to receive the message by sending the string “READY<CR><LF>”
(hex 52 45 41 44 59 0D 0A) to the DTE.