Specifications

ISU AT Command Reference Phase IV AT Commands
Iridium Proprietary Version 2.45
20 June 2011 70
8.15 +SBDRT - Short Burst Data: Read a Text Message from the ISU
Exec Command: +SBDRT
This command is used to transfer a text SBD message from the single mobile terminated buffer in the ISU
to the FA. This command is similar to +SBDRB but does not provide a length indicator or checksum. The
intent of this command is to provide a human friendly interface to SBD for demonstrations and application
development. It is expected that most usage of SBD will be with binary messages.
 Once the command is entered, the SBD message in the mobile terminated buffer is sent out of
the port.
 This command is similar to +SBDRB except no length or checksum will be provided.
 The maximum mobile terminated SBD message length is 1890 bytes.
 The mobile terminated message buffer will be empty upon power-up.
Command Response:
+SBDRT: <CR> {mobile terminated buffer}
8.16 +SBDI - Short Burst Data: Initiate an SBD Session (Initial implementation;
revised in Phase VI)
Exec Command: +SBDI
This command initiates an SBD session between the ISU and the ESS. If there is a message in the mobile
originated buffer it will be transferred to the ESS. Similarly if there is one or more messages queued at the
ESS the oldest will be transferred to the ISU and placed into the mobile terminated buffer.
 The message, if any, in the mobile originated buffer will be sent from the ISU to the ESS.
 If there is a message queued at the ESS it will be transferred to the ISU and placed into the
mobile terminated buffer.
Command Response:
+SBDI:<MO status>,<MOMSN>,<MT status>,<MTMSN>,<MT length>,<MT queued>
where:
<MO status>:
MO session status provides an indication of the disposition of the mobile originated transaction.
The field can take on the following values:
0: No SBD message to send from the ISU.
1: SBD message successfully sent from the ISU to the ESS.
2: An error occurred while attempting to send SBD message from ISU to ESS.
<MOMSN>:
The Mobile Originated Message Sequence Number (MOMSN) is a value assigned by the ISU