Specifications

ISU AT Command Reference Phase IV AT Commands
Iridium Proprietary Version 2.45
20 June 2011 69
8.13 +SBDRB - Short Burst Data: Read Binary Data from ISU
Exec Command: +SBDRB
This command is used to transfer a binary SBD message from the single mobile terminated buffer in the
ISU to the FA. 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 1890 bytes.
 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 ISU were to send the
word “hello” encoded in ASCII to the FA 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 ISU, 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 ISU for this command.
8.14 +SBDWT - Short Burst Data: Write a Text Message to the ISU (Initial
implementation; revised in Phase VI)
Exec Command: +SBDWT=[<text message>]
This command is used to transfer a text SBD message from the FA to the single mobile originated buffer in
the ISU.
 The length of <text message> is limited to 120 bytes. This is due to the length limit on the
AT command line interface.
 The message is terminated when a carriage return is entered.
 The mobile originated buffer will be empty upon power-up.
Command Response:
OK: SBD message successfully stored in mobile originated buffer.
ERROR: An error occurred storing SBD message in mobile originated buffer