AL3A-RM User Guide Version B
Document Number: 451-93156-002B
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2: SBD message checksum sent from DTE does not match the checksum
calculated at the A3LA-RM.
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.
B.86
+SBDRB
–
S
HORT
B
URST
D
ATA
:
R
EAD
B
INARY
D
ATA
Exec Command:
+SBDRB
This command is used to transfer a binary SBD message from the single mobile
terminated buffer in the A3LA-RM to the DTE. 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
message not including the length field or the mandatory two-byte checksum.
The high order byte will 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
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.
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.
B.87
+SBDRT
–
S
HORT
B
URST
D
ATA
:
R
EAD
T
EXT
M
ESSAGE
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
