User's Manual

Iridium Satellite LLC
9601 Transceiver –AT Command Reference
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Information contained herein is preliminary and subject to change without further notice
This command is used to transfer a binary SBD message from the DTE to the
single mobile originated buffer in the 9601. The mobile originated buffer can
contain only one message at any one time.
 Once the command is entered, and the message length is acceptable, the 9601
will indicate to the DTE that it is prepared to receive the message by sending
the ASCII encoded string “READY<CR><LF>” (hex 52 45 41 44 59 0D 0A) to the
DTE.
 The <SBD message length> parameter represents the length, in bytes, of the SBD
message not including the mandatory two-byte checksum.
 The maximum mobile originated SBD message length is specified at 205 bytes
(and may be increased following actual performance testing). The minimum
mobile originated SBD message length is 1 byte. If the <SBD message length>
parameter is out of range, the 9601 issues response 3 (see below).
 Once the DTE receives the READY indication from the 9601, the SBD message
must be sent from the DTE formatted as follows:
{binary SBD message} + {2-byte checksum}
 The checksum is the least significant 2-bytes of the summation of the entire
SBD message. The high order byte must be sent first. For example if the
DTE were to send the word “hello” encoded in ASCII to the 9601 the binary
stream would be hex 68 65 6c 6c 6f 02 14.
 The mobile originated buffer will be empty upon power-up.
 If any data is currently in the mobile originated buffer, it will be overwritten.
Command Response:
0 SBD message successfully written to the 9601.
1 SBD message write timeout. An insufficient number of bytes were
transferred to 9601 during the transfer period of 60 seconds.
2 SBD message checksum sent from DTE does not match the
checksum calculated at the 9601.
3 SBD message size is not correct. The maximum mobile originated
SBD message length is 1960 bytes. The minimum mobile originated
SBD message length is 1 byte.
2.30 +SBDRB –Short Burst Data: Read Binary Data from the Module
Exec Command: +SBDRB