Transmit ASCII data

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Line endings

Note that RockBLOCK expects commands to be terminated with a carriage return (\r) character.

Using a line-feed (\n) character will not work!

With your RockBLOCK connected to a suitable power supply, check that your serial communications are established (default 19200, 8N1) and issue the following commands.

/* Issue AT command */

AT\r

/* Receive response */

OK\r

/* Turn off Flow Control */

AT&K0\r

/* Receive response */

OK\r

/* Insert ASCII message into MO buffer */

AT+SBDWT=Hello World\r 

/* Receive response */

OK\r

/* Initiate an Extended SBD Session */

AT+SBDIX\r

/* Receive response */ 

+SBDIX: <MO status>, <MOMSN>, <MT status>, <MTMSN>, <MT length>, <MT queued>\r

/* See SBDIX Key for information on each parameter */

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SBDIX Key

The SBDIX command denotes the status of your sent, received and queued messages:

- Any returned number with a value of 0 to 2 indicates your message has been successfully transmitted. Any number above 2 indicates that the message has not been successfully transmitted.

- This number denotes the MO message number and cycles between 0 and 65535.

0 - No messages waiting to be received. 1 - New message successfully received. 2 - Error during mailbox check / message reception.

- This number denotes the MT message number and cycles between 0 and 65535.

- The size (in bytes) of the MT message.

- The number of MT messages in the queue waiting to be downloaded.

An SBDIX response of 0,0,0,0,0,0 indicates that a message was transmitted successfully, that there were no MT messages downloaded during this SBD session and that no messages are waiting in the queue to be downloaded.

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Further information on AT commands

Please refer to the Iridium ISU AT Command Reference for more information on the available AT commands.

AT commands in this chapter

+SBDWT
+SBDIX[A]