ISU AT Command Reference

ISU AT Command ReferencePhase IV AT Commands8.11 +SBDRB - Short Burst Data: Read Binary Data from ISUExec Command: +SBDRBThis command is used to transfer a binary SBD message from the single mobile terminated buffer in theISU to the FA. The mobile terminated buffer can contain only one message at any one time.• The SBD message is transferred formatted as follows:{2-byte message length} + {binary SBD message} + {2-byte checksum}• The {2-byte message length} field represents the length, in bytes, of the SBD messagenot including the length field or the mandatory two-byte checksum. The high order bytewill be sent first.• The maximum mobile terminated SBD message length is 1890 bytes.• The checksum is the least significant 2-bytes of the summation of the entire SBDmessage. The high order byte will be sent first. For example if the ISU were to send theword “hello” encoded in ASCII to the FA the binary stream would be hex 00 05 68 65 6c6c 6f 02 14.• If there is no mobile terminated SBD message waiting to be retrieved from the ISU, themessage length and checksum fields will be zero.• The mobile terminated message buffer will be empty upon power-up.Command Response:There are no response codes generated by the ISU for this command.8.12 +SBDWT - Short Burst Data: Write a Text Message to the ISU (Initialimplementation; revised in Phase VI)Exec Command: +SBDWT=[]This command is used to transfer a text SBD message from the FA to the single mobile originated buffer inthe ISU.• The length of is limited to 120 bytes. This is due to the length limit on theAT command line interface.• The message is terminated when a carriage return is entered.• The mobile originated buffer will be empty upon power-up.Command Response:OK: SBD message successfully stored in mobile originated buffer.ERROR: An error occurred storing SBD message in mobile originated bufferVersion 2.6March 30, 2006 63