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Iridium Satellite LLC
Short Burst Data Developers Guide V2.01
4.1.4.4 Power Down
1. Before turning the ISU off, the Field Application should tell the GSS not to send any further
SBD Ring Alerts. The Field Application will need to issue the +SBDDET to the ISU which
wil tel the GSS to “stop sending SBD Ring Alerts” or DETach from the GSS.
2. When the response code for +SBDDET indicates a successful detach the ISU can be
powered off.
3. At power up the method described in Section 4.1.4.1 should be used to restart the GSS
sending SBD Ring Alerts.
9601 Power Down Process
NO
AT+SBDDET
OK?
AT*F
STOP
29
YES
4.1.5 SBD Automatic Notification: Automatic Registration
(+SBDAREG)
In order for the ISU to receive the SBD Ring Alert Notification, the GSS must have the current location of the ISU.
This location is updated by the SBD Network Registration and each time a SBD session takes place. For fixed
location ISUs and ISUs that do not travel more than approximately 100 miles between SBD sessions, the
+SBDREG command is sufficient. If the ISU is mobile and can possible move more than 100 miles between SBD
sessions, the +SBDAREG command should be used for SBD Network Registration. Both commands perform the
same SBD Network Registration, however, the +SBDAREG command continually runs an algorithm which
estimates the distance the ISU has moved since the previous SBD session. If the result indicates the ISU has
moved ‘too’ far, the ISU automaticaly issues an updated SBD Network Registration.
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