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Command Groups
use a swapped by
te order where the least significant byte is transferred first. The
byte order is ignored when DATa:WIDth is set to 1.
Waveform Data and Record
Lengths
You can transfer multiple points for each waveform record. You can transfer a
portion o f th
e waveform or you can transfer the entire record. You can use the
DATa:STARt and DATa:STOP commands to specify the first and last data points
of the waveform record.
When transferring data into the oscilloscope, you must first specify the record
length of the destination waveform record. You do this with the WFMInpre:NR_Pt
command. Next, specify the first data point within the waveform record. For
example, when you set DATa:STARt to 1, data points w ill be stored starting
with the first point in the record. The oscilloscope will ignore the value set by
DATa:ST
OP when reading in data. It will stop reading data when there is no data
to read or when it has reached the specified record length.
When tra
nsferring data from the oscilloscope, you must specify the first and last
data points in the waveform record. Setting DATa:STARt to 1 and DATa:STOP to
the record length will always return the entire waveform.
Waveform Data Locations
and Memory Allocation
The DA
Ta:SOUrce command specifies the waveform source when transferring a
waveform from the oscilloscope. You can only transfer one waveform at a time.
Waveforms sent to the oscilloscope are always stored in one of the reference
memory locations. Use the DATa:DESTination command to specify a reference
memory location.
Waveform Preamble
Each waveform you transfer has an associated waveform preamble, which
contains information such as horizontal scale, vertical scale, and the other settings
in effect when the waveform was created. Refer to the individual WFMInpre and
WFMOutpre commands for information.
S
caling Waveform Data
Once you transfer the waveform data to the controller, you can convert the data
points into v oltage values for analysis using information from the waveform
preamble.
MSO4000 and DPO4000 Series Programmer Manual 2-63