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TDF Trace Data Format
!IDFB
Description: TDF B enables the binary format. With the binary format, the marker or trace
data is transferred as bytes. Of all the trace data formats, TDF B transfers trace data the
fastest. The setting of the MDS command determines whether the trace data is transferred as
one
or two 8-bit bytes.
Restrictions: The TDF B format cannot be used to send data back to the spectrum analyzer
(you must use the A-block format to send data back to the spectrum analyzer).
How data is returned: The following table describes what is transferred when the trace data
format is set to B, but the MDS setting is changed.
Trace Data Transfers with TDF B
MDS
Example
Description
Setting
Binary
TDF
B;MDS
B;TA;
Transfers the 401 bytes of trace data. Using MDS B “reduces” the
trace value into 1 byte by dividing (DIV) the trace value by 32. The
trace data transfer
ls
ended with an EOI.
Word
TDF
B;MDS
W;TA;
Transfers the 802 bytes of trace data. MDS W uses two bytes per trace
element to transfer trace data. The ilrst byte contains the trace value
divided by (DIV) 256, the second byte contains the remainder (MOD)
of that division. The trace data transfer is ended with an EOI.
Example of how data is returned: For the same trace A data that is used in the TDF P
description, querying trace A with the TDF B format and MDS set to binary (MDS B) would
return the ASCII character codes for the following:
(8000 div
32)(7000
div
32)(6000
div
32)(the
number for 6000 div 32 is repeated 398 times)
If MDS is set to W, querying trace A with the TDF B format would return the ASCII character
codes for following:
(8000 div
256)(8000
mod
256)(7000
div
32)(7000
mod
256)(6000
div
256)(6000
mod
256)(the
number for 6000 div 256, then
the
number for 6000 mod 256 is repeated 398 times)
TDFM
Description: TDF M is the measurement data format. The measurement data format transfers
trace data in measurement units, and the measurement data can range from -32768 to
+ 32767.
Restrictions: TDF M cannot be used to send trace data back to the spectrum analyzer.
How trace data is returned: The following table describes what is transferred when the trace
data format is set to M.
Trace Data Transfers with TDF M
Example
TDF
M;TA;
Description
Transfers 401 bytes, with each trace value ln measurement units. The trace data transfer is
ended with a carriage return, a line feed with an EOI.
Example of how data is returned: For the same trace A data that is used in the TDF P
description, querying trace A with the TDF M would return the ASCII character codes for the
following:
8000,7000,6000,(6000
repeated 398
times),<CR><LF>
Programming Commands 5-547