NAL Research Corporation (451-93156-002A)
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The {2-byte message length} field represents the length, in bytes, of the SBD
message not including the length field or the mandatory two-byte checksum.
The high order byte will be sent first.
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The maximum mobile terminated SBD message length is 1890 bytes.
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The checksum is the least significant 2-bytes of the summation of the entire
SBD message. The high order byte will be sent first. For example if the A3LA-
RM were to send the word “hello” encoded in ASCII to the DTE the binary
stream would be hex 00 05 68 65 6c 6c 6f 02 14.
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If there is no mobile terminated SBD message waiting to be retrieved from the
A3LA-RM, the message 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 A3LA-RM for this command.
A.8.87 +SBDRT – Short Burst Data: Read Text Message
Exec Command: +SBDRT
This command is used to transfer a text SBD message from the single mobile terminated buffer
in the A3LA-RM to the DTE. This command is similar to +SBDRB but does not provide a length
indicator or checksum. The intent of this command is to provide a human friendly interface to
SBD for demonstrations and application development. 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 of the 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: <CR> {mobile terminated buffer}
A.8.88 +SBDD – Short Burst Data: Clear SBD Message Buffer(s)
Exec Command: +SBDD[<Delete type>]
This command is used to clear the mobile originated buffer, mobile terminated buffer or both.
The <Delete type> parameter identifies which buffers are cleared.
0: Clear the mobile originated buffer
1: Clear the mobile terminated buffer
2: Clear both the mobile originated and mobile terminated buffers
Using this command or power cycling the phone are the only means by which both
buffers are cleared.
The mobile terminated buffer will be cleared when an SBD session is initiated.
Sending a message from the A3LA-RM to the ESS does not clear the mobile originated
buffer.
Reading a message from the A3LA-RM does not clear the mobile terminated buffer.
Command Response: