Specifications

ISU AT Command Reference Phase VI AT Commands
Iridium Proprietary Version 2.45
20 June 2011 89
10.19 +SBDSX - Short Burst Data: Status Extended
Exec Command: +SBDSX
This command returns current state of the mobile originated and mobile terminated buffers, and the SBD
ring alert status.
Command Response:
+SBDSX: <MO flag>, <MOMSN>, <MT flag>, <MTMSN>, <RA flag>, <msg
waiting>
where:
<MO flag>:
The MO flag indicates the existence of a message in the mobile originated buffer. The response from the
ISU is one of the following numeric codes:
0 No message in mobile originated buffer.
1 Message in mobile originated buffer.
<MOMSN>:
The MOMSN identifies the sequence number that will be used during the next mobile originated SBD
session.
<MT Flag>:
The MT flag indicates the existence of a message in the mobile terminated buffer. The response from the
ISU is one of the following numeric codes:
0 No message in mobile terminated buffer.
1 Message in mobile terminated buffer.
<MTMSN>:
The MTMSN identifies the sequence number that was used in the most recent mobile terminated SBD
session. This value will be –1 if there is nothing in the mobile terminated buffer.
<RA flag>:
The RA flag indicates whether an SBD ring alert has been received and still needs to be answered.
0 No SBD ring alert.
1 SBD ring alert has been received and needs to be answered.
Note: The RA flag is set whenever the ISU receives an SBD ring alert; this happens even if the +SBDMTA
setting specifies that SBD ring indications are disabled.
The RA flag is cleared only on successful completion of an SBD mailbox check, i.e. an SBD session
invoked with +SBDI[X[A]] in which the returned MT status indicates that no error occurred.
The value of the RA flag is stored in non-volatile memory so it is preserved across power cycling of the
ISU.
<msg waiting>:
The message waiting flag indicates how many SBD mobile terminated messages are currently queued at the
gateway awaiting collection by the ISU. This flag is updated after every SBD session, including +SBDI,
+SBDIX, +SBDIXA, +SBDREG and +SBDDET.