User Manual

Command Groups
Table 2-28: Waveform commands (cont.)
Command Description
WFMPre:X INcr
Set or query the horizontal sampling interval
WFMPre:XUNit
Set or query the horizontal units
WFMPre:XZEro
Set or query the time of first data point in
waveform
WFMPre:YMUlt
Set or query the vertical scale factor
WFMPre:YOFf Set or query the vertical position
WFMPre:YUNit
Set or query the vertical units
WFMPre:YZEro
Set or query the waveform conversion factor
(TPS200 with TDS2MM module, TDS1000,
TDS2000, TDS1000B, TDS2000B,
TDS2000C, and TPS 2000 only.
Waveform Data Formats
Internally, the oscilloscope uses one 8-bit data byte to represent each waveform
data point, regardless of the acquisition mode.
The DATa:WIDth command lets you specify the number of bytes per data point
when transferring data to and from an oscilloscope. This provides compatibility
with other digitizing oscilloscopes.
When DATa:WIDth is set to two:
If sending data, the oscilloscope multiplies each point by 256; the most
significant byte then has meaningful data and the least significant byte is 0
If receiving data, the oscilloscope truncates the data (divides by 256) and
saves the most significant byte
NOTE. The oscilloscopes uses these methods to handle waveforms transmitted in
ASCII or binary format.
The oscilloscope can transfer waveform data in either ASCII or binary format.
Use the DATa:ENCdg c ommand to specify one of the following formats:
ASCII data is represented by signed integer values. The range of 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 character
for the minus sign if the value is negative, one to five ASCII characters for the
waveform value, and a comma to separate data points.
An example of an ASCII waveform data string follows:
2-28 TDS200, TDS1000/2000, TDS1000B/2000B, TDS2000C, TPS2000 Programmer