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Iridium Communications, Inc.
Iridium 9523 Product Developers' Guide
Revision 2.6
3
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and <sri> indicates the SBD ring indication status:
0
No SBD ring alert received
1
SBD ring alert received
Note: It is valid for the Iridium 9523 to receive a telephony ring alert and an SBD ring alert at the same
time. Assertion of the RI signal indicates only the presence of an alert; this command may be used to
determine the type(s) of ring alert.
5.7.96 +CSQ[F] – Signal Quality
Exec Command: +CSQ[F]
Execution command returns the received signal strength indication <rssi> from the Iridium 9523.
Response is in the form:
+CSQ: <rssi>
where <rssi> is:
0
Equivalent to 0 bars displayed on the signal strength indicator
1
Equivalent to 1 bar displayed on the signal strength indicator
2
Equivalent to 2 bars displayed on the signal strength indicator
3
Equivalent to 3 bars displayed on the signal strength indicator
4
Equivalent to 4 bars displayed on the signal strength indicator
5
Equivalent to 5 bars displayed on the signal strength indicator
Note: The +CSQ form of the command waits for an updated signal strength reading to become available.
This will usually be within two seconds of issuing the command. If the Iridium 9523 is in the process of
acquiring the system, or in a satellite handoff, a delay in response of up to 10 seconds may be
experienced.
If the Iridium 9523 has no SIM, is awaiting a SIM PIN entry, has an invalid SIM, or has otherwise not
proceeded to successful registration, the delay in response may exceed the 50 second timeout limit.
Under such condition, an ERROR response will be received. To avoid a delayed response due to
registration problems, issue the +CREG command to verify registration prior to entering the +CSQ
command to obtain signal strength.
Note: The +CSQF form of the command returns immediately, reporting the last known signal strength.
Test Command: +CSQ=?
List the supported signal strength indications. The response is in the form:
+CSQ: (supported <rssi>s)
5.7.97 +CULK – Unlock
Exec Command: +CULK=<unlock key>
Unlock the SBD functionality of the ISU after it has been locked by the Gateway. The unlock key must be
obtained by contacting Iridium's customer support.
<unlock key>:
0000000000000000 .. FFFFFFFFFFFFFFFF
A string of 16 hexadecimal digits
Iridium Communications, Inc.
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