User Manual

Iridium Communications, Inc. Information Contained in this Guide
Iridium 9523 Product Developers’ Guide is Subject to Change Without Notice
Revision 2.6
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The MT flag indicates the existence of a message in the mobile terminated buffer. The response from the
Iridium 9523 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 Iridium 9523 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
Iridium 9523.
<msg waiting>:
The message waiting flag indicates how many SBD mobile terminated messages are currently queued at
the gateway awaiting collection by the Iridium 9523. This flag is updated after every SBD session,
including +SBDI, +SBDIX, +SBDIXA, +SBDREG and +SBDDET.
5.7.112 +ADJANT – User Antenna Adjustment Required
Exec Command: none
Unsolicited Announcement:
+ADJANT:<adj_required>
where:
<adj_required>:
The adj_required flag indicates whether the user needs to adjust the L-band antenna position to improve
reception.
0 Adjustment no longer required
1 Adjustment required
The “+ADJANT:1” message will be sent up to three times, at 5-second intervals, if Layer 1 is attempting to
acquire an L-band bearer but is unable to receive the BCCH transmission from the SV, whether the
attempt is due to an MT call (prior to RING indication), MO call, or Location Update etc.
It is an indication that the user needs to deploy the antenna or adjust it to a better orientation/location.
Note that if the acquisition fails or succeeds, there will in most cases be a subsequent “+ADJANT:0”, but
this is not guaranteed in all cases.
5.7.113 +WANTST, +ANTST – Antenna status
Exec Command: