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Command Groups
2–36
TLS 216 Programmer Manual
Waveform Group Commands
Waveform commands let you transfer waveform data points to and from the
logic scope. Waveform data points are a collection of values that define a
waveform. One data value usually represents one data point in the waveform
record. When working with enveloped waveforms, each data value is either the
min or max of a min/max pair. Before you transfer waveform data, you must
specify the data format, record length, and waveform locations.
Acquired waveform data uses either one or two 8-bit data bytes to represent each
data point. The number of bytes used depends on the acquisition mode specified
when you acquired the data. Data acquired in SAMple or ENVelope mode uses
one 8-bit byte per waveform data point. Data acquired in AVErage mode uses
two 8-bit bytes per point. For more information on the acquisition modes see the
ACQuire: MODe command on page 2–41.
The DATa:WIDth command lets you specify the number of bytes per data point
when transferring data to and from the logic scope. If you specify two bytes for
data that uses only one, the least significant byte will be filled with zeros. If you
specify one byte for data that uses two, the least significant byte will be ignored.
The logic scope can transfer waveform data in either ASCII or binary format.
You specify the format with the DATa:ENCdg command.
ASCII Data. ASCII data is represented by signed integer values. The range of the
values depends on the byte width specified. One byte wide data ranges from
–128 to 127. Two byte wide data ranges from –32768 to 32767.
Each data value requires two to seven characters. This includes one to five
characters to represent the value, another character, if the value is negative, to
represent a minus sign, and a comma to separate the data points.
An example ASCII waveform data string may look like this:
CURVE<space>-110,-109,-110,-110,-109,-107,-109,-107,
-106,-105,-103,-100,-97,-90,-84,-80
Use ASCII to obtain more human readable and easier to format output than
binary. On the other side, it may require more bytes to send the same values with
ASCII as binary. This may reduce transmission speeds.
Binary Data. Binary data can be represented by signed integer or positive integer
values. The range of the values depends on the byte width specified. When the
byte width is one, signed integer data ranges from –128 to 127, and positive
integer values range from 0 to 255. When the byte width is two, the values range
from –32768 to 32767.
Waveform Data Formats