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Iridium Communications, Inc.
Iridium 9523 Product Developers' Guide
Revision 2.6
15
Access is denied
Iridium 9523-reported values:
16
Modem has been locked and may not make SBD calls (see +CULK command)
17
Gateway not responding (local session timeout)
18
Connection lost (RF drop)
19
Link failure (A protocol error caused termination of the call)
20..31 Reserved, but indicate failure if used
32
No network service, unable to initiate call
33..34 Reserved, but indicate failure if used
35
Iridium 9523 is busy, unable to initiate call
36..
Reserved, but indicate failure if used
<MOMSN>:
The Mobile Originated Message Sequence Number (MOMSN) is a value assigned by the Iridium 9523
when sending a mobile-originated message to the GSS. This value is incremented each time an SBD
session is successfully completed between the Iridium 9523 to the GSS. This wraparound counter can
range from 0 to 65535.
<MT status>:
The MT status provides an indication of the disposition of the mobile terminated transaction. The field
can take on the following values:
0
No SBD message to receive from the GSS
1
SBD message successfully received from the GSS
2
An error occurred while attempting to perform a mailbox check or receive a message
from the GSS
<MTMSN>:
The Mobile Terminated Message Sequence Number (MTMSN) is assigned by the GSS when forwarding
a message to the Iridium 9523. This value is indeterminate if the field <MT status> is zero.
wraparound counter can range from 0 to 65535.
<MT length>:
The MT length is the length in bytes of the mobile terminated SBD message received from the GSS. If no
message was received, this field will be zero.
<MT queued>:
MT queued is a count of mobile terminated SBD messages waiting at the GSS to be transferred to the
Iridium 9523.
5.7.107 +SBDDSC - Short Burst Data: Delivery Short Code
Set Command: +SBDDSC=<dsc>
Set the Delivery Short Code (DSC), which provides dynamic routing or control information for MO or MT
messages. This is an 8-bit value providing the ability to set individual fields. Value 0x80 (hexadecimal)
sets the most significant bit. Value 0x01 sets the least significant bit. Flag values can be added together
to achieve a combination of settings. Some fields are overridden during certain SBD sessions (e.g. a
+SBDREG registration session sets flag 0x80).
Iridium Communications, Inc.
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