DRS WJ-8611, Инструкция по установке, эксплуатации и обслуживанию

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8611/SM SIGNAL MONITOR OPTION
A-14 APPENDIX A
Table A-3. 8611/SM Commands (Continued)
Command Function Description
A1
H
Data
Compression
This command selects the effective display resolution, and provides a
simple form of data compression. If less than the maximum number of
points is selected, the WJ-9168 chooses the peak value from a set of
points and sends only this value. Thus, if the Compression parameter is
02
H
, then the number of points sent is 1/4 of the maximum, and the
WJ-9168 sends the peak value of every four data points. If the resolution
bandwidth is 25 kHz, the effective display resolution will be 100 kHz. This
command is effective in reducing the data handling and display load on
the host computer.
Data Range: 00
H
- Maximum Number of Points
01
H
- 1/2 of the Maximum Number of Points
02
H
- 1/4 of the Maximum Number of Points
Default: 00
H
Example: A101
H
- Set Compression for 1/2 of the Maximum Number
of Points
A2
H
Start
Processing
This command begins the sweep mode according to the current sweep
parameters. The data transfer format depends on the selected data
transmission mode. Subsequent blocks of data must be requested with
the Send Next Data Block command (A4
H
). Note that the sweep
continues while prior data is being transferred. The sweep function
remains in effect until the Stop Processing command (A3
H
), or another
command is received. When the sweep parameters are changed, the
sweep must be restarted with the Start Processing command.
There is one situation that can halt the frequency sweep. This is when
the data buffer is full. If the Selected Data Transfer mode (AC
H
) is 00
H
,
then the WJ-9168 only stores a limited number of data points (two blocks
of data). If the controlling computer does not request the next block of
data with the Send Next Data Block command, the WJ-9168 sweep data
buffers will fill. This will temporarily halt the sweep until data transfer is
restarted.
A3
H
Stop
Processing
Halt any data processing currently underway. The Start Processing
command must be used to begin processing again; processing will start
with a new sweep and new data block. Any prior sweep or data block
information is lost.
A4
H
Send Next
Data Block
Unless the Select Data Transmission Mode (AC
H
) is set to 02
H
, data is
sent one block at a time. When a block has been sent, the controlling
computer must request each new block with this command. Suspending
data transmission allows the controlling computer to perform other
processing or use the interface for other communications between
WJ-9168 data blocks. Also, slower computers will not be overwhelmed
with a continuous string of data.
The Send Next Data Block Command does not provide an ACK/NACK
response. This eliminates the display program’s need to strip extra
characters from the data stream.
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