ISU AT Command Reference

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ISU AT Command ReferencePhase IV AT Commands8.13 +SBDRT - Short Burst Data: Read a Text Message from the ISUExec Command: +SBDRTThis command is used to transfer a text SBD message from the single mobile terminated buffer in the ISUto the FA. This command is similar to +SBDRB but does not provide a length indicator or checksum. Theintent of this command is to provide a human friendly interface to SBD for demonstrations and applicationdevelopment. It is expected that most usage of SBD will be with binary messages.• Once the command is entered, the SBD message in the mobile terminated buffer is sent out ofthe port.• This command is similar to +SBDRB except no length or checksum will be provided.• The maximum mobile terminated SBD message length is 1890 bytes.• The mobile terminated message buffer will be empty upon power-up.Command Response:+SBDRT: {mobile terminated buffer}8.14 +SBDI - Short Burst Data: Initiate an SBD Session (Initial implementation;revised in Phase VI)Exec Command: +SBDIThis command initiates an SBD session between the ISU and the ESS. If there is a message in the mobileoriginated buffer it will be transferred to the ESS. Similarly if there is one or more messages queued at theESS the oldest will be transferred to the ISU and placed into the mobile terminated buffer.• The message, if any, in the mobile originated buffer will be sent from the ISU to the ESS.• If there is a message queued at the ESS it will be transferred to the ISU and placed into themobile terminated buffer.Command Response:+SBDI:,,,,,where::MO session status provides an indication of the disposition of the mobile originated transaction.The field can take on the following values:0: No SBD message to send from the ISU.1: SBD message successfully sent from the ISU to the ESS.2: An error occurred while attempting to send SBD message from ISU to ESS.:The Mobile Originated Message Sequence Number (MOMSN) is a value assigned by the ISUwhen sending a mobile-originated message to the ESS. This value is incremented each time anVersion 2.6March 30, 2006 64
ISU AT Command ReferencePhase IV AT CommandsSBD session is successfully completed between the ISU to the ESS. This wrap around countercan range from 0 to 65535.:The MT status provides an indication of the disposition of the mobile terminated transaction. Thefield can take on the following values:0: No SBD message to receive from the ESS.1: SBD message successfully received from the ESS.2: An error occurred while attempting to perform a mailbox check or receive a messagefrom the ESS.:The Mobile Terminated Message Sequence Number (MTMSN) is assigned by the ESS whenforwarding a message to the ISU. This value is indeterminate if the field is zero.This wrap around counter can range from 0 to 65535.:The MT length is the length in bytes of the mobile terminated SBD message received from theESS. If no message was received, this field will be zero.:MT queued is a count of mobile terminated SBD messages waiting at the ESS to be transferred tothe ISU.Version 2.6March 30, 2006 65
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