Specifications

ISU AT Command Reference Phase VI AT Commands
Iridium Proprietary Version 2.45
20 June 2011 85
<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 ISU. This value is indeterminate if the field <MT status> is zero. This wrap around
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 ISU.
10.15 +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. an
+SBDREG registration session sets flag 0x80).
Enable or disable ring indications for SBD Ring Alerts.
<dsc>:
0..255 DSC to be used for subsequent MO messages (0 default).
0x80 Hold MT message delivery.
0x40 Leave MT message in queue after delivery.
0x20 Destination in MO payload.
Read Command: +SBDDSC?
Query the current Delivery Short Code. The response is of the form:
+SBDDSC:<dsc>
10.16 +SBDMTA - Short Burst Data: Mobile-Terminated Alert
Set Command: +SBDMTA=<mode>
Enable or disable ring indications for SBD Ring Alerts.
<status>:
0 Disable ring indication.
1 Enable ring indication (default).
When SBD ring indication is enabled, the ISU asserts the RI line and issues the unsolicited result code