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Agilent E1441A SCPI Command Reference 79
Chapter 3
Downloading a
Binary Block of
Data
Using the IEEE-488.2 Binary Block Format
In the binary block format, a block header precedes the waveform data.
The block header has the following format:
#532000
where:
# = Start of data block
5 = Number of digits to follow
32000 = Even number of bytes to follow
(32,000 bytes = 16,000 points)
The function generator represents binary data as 12-bit integers;the data is sent
as two bytes. Therefore, the total number of bytes is always twice the
number of data points in the waveform (and must always be an even
number ). For example, 32,000 bytes are required to download a waveform
with 16,000 points.
Use the
FORM:BORD command to select the byte order for binary transfers in
block mode. If you specify FORM:BORD NORM (default), the most-significant
byte (MSB) of each data point is sent first. If you specify FORM:BORD SWAP,
the least-significant byte (LSB) of each data point is sent first. Most PCs use
the “swapped” byte order.
:ATTRibute:AVERage?
DATA:ATTRibute:AVERage? [<arb name>] queries the arithmetic average of all
data points for the specified arbitrary waveform. The default arb name is the
arbitrary waveform currently active (selected with FUNC:USER command).
Parameters • The arb name may contain up to 8 characters. The first character must be a
letter (A-Z), but the remaining characters can be numbers (0-9) or the
underscore character (“ _ ”). Blank spaces are not allowed. If you specify a
name with more than 8 characters, a +783, “Arb waveform name too long”
error is generated.
• The function generator does not distinguish between upper- and lower-case
letters for the arbitrary waveform name. Therefore, ARB_1 and arb_1 are the
same name. All characters are converted to upper case.
Comments • If you query a waveform that is not currently stored in memory, a +785,
“Specified arb waveform does not exist” error is generated.
:ATTRibute:CFACtor?
DATA:ATTRibute:CFACtor? [<arb name>] queries the crest factor of all data
points for the specified arbitrary waveform. Crest factor is the ratio of the peak value
to the RMS value of the waveform. The default arb name is the arbitrary waveform
currently active (selected with FUNC:USER command).