NAL RESEARCH CORPORATION A3LA-R, Руководство пользователя

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A3LA-R-MIL-MOD User Guide Version B
Document Number: 451-93156-001A 84 of 159
o
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.
o
The maximum mobile terminated SBD message length is 1890 bytes.
o
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-R 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.
o
If there is no mobile terminated SBD message waiting to be retrieved
from the A3LA-R, 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-R 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-R 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}