8611/SM SIGNAL MONITOR OPTION
APPENDIX A
A-11
transmission is established by the sweep length that has been set by the last
Sweep Span Select (A0
H
) and Compression (A1
H
) commands.
Block Format: Single block of variable size depending on sweep span and
compression selections. Three-byte prefix (identifier byte, FE
H
, and two-byte
value which indicates the number of data points in the block).
Examples:
If the A0
H
command argument is 00
H
, and the A1
H
command argument is 00
H
, the sweep contains 400
data points (refer to
Table A-3
). The single block of
data transferred contains 400 data bytes (one for each
point).
If the A0
H
command argument is 06
H
, and the A1
H
command argument is 01
H
, the sweep contains 80 data
points (160 points compressed by 1/2 as described in
Table A-3
). The single block of data transferred
contains, therefore, 80 data bytes (one for each point).
The data bytes are preceded by an identifier byte (FE
H
) and a two-byte value,
which indicates the length of the block. Since this format uses a variable
length data block, the block is always a full block, never partial. If a Stop
Processing command is sent during transmission of the data block, two to four
additional data points may be sent before the data stream is stopped and an
ACK response to the Stop Processing command is sent.
CONTINUOUS
SINGLE
BLOCK/SINGLE
SWEEP
DATA
TRANSFER
This type of data transfer is set up when the Select Data Transmission Mode
(AC
H
) command is sent with the 02
H
argument. In this data transfer mode, the
WJ-9168 begins the transfer of panoramic signal strength information when a
Start Processing command (A2
H
) is sent. The data is transmitted in variable
length blocks set up under the same protocol used for the single block
transmission described above (i.e., the length of the block established by the
sweep length set by the A0
H
and A1
H
commands). The data bytes in each
block are similarly preceded by an identifier byte (FE
H
) and a two-byte value,
which indicates the length of the block. Since this format uses a variable
length data block, each block is always a full block, never partial. Successive
blocks of data are transmitted continuously until the Stop Processing
command (A3
H
) is sent. When the Stop Processing command is sent, two to
four additional data points may be sent before the data stream is stopped and
an ACK response to the Stop Processing command is sent.
Courtesy of http://BlackRadios.terryo.org
Summary of Contents for WJ-8611
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