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Chapter 4 Remote Interface Reference
Arbitrary Waveform Commands
4
DATA:DAC VOLATILE, {<binary block>|<value>, <value>, . . . }
Download binary or decimal integer values from -2047 to +2047 into
volatile memory. You can download from 1 to 65,536 (64K) points per
waveform in IEEE-488.2 binary block format or as a list of values.
The range of values corresponds to the values available using internal
12-bit DAC (Digital-to-Analog Converter) codes. The function generator
takes the specified number of points and expands them to fill waveform
memory. If you download less than 16,384 (16K) points, a waveform with
16,384 points is automatically generated. If you download more than
16,384 points, a 65,536-point waveform is generated.
• The values -2047 and +2047 correspond to the peak values of the
waveform (if the offset is 0 volts). For example, if you set the output
amplitude to 10 Vpp, “+2047” corresponds to +5V and “-2047”
corresponds to -5V.
• The maximum amplitude will be limited if the data points do not
span the full range of the output DAC. For example, the built-in
“Sinc” waveform does not use the full range of values between ±2047
and therefore its maximum amplitude is 6.087 Vpp (into 50 ohms).
•The DATA:DAC command overwrites the previous waveform in
volatile memory (and no error will be generated). Use the DATA:COPY
command to copy the waveform to non-volatile memory.
• Up to four user-defined waveforms can be stored in non-volatile
memory. Use the DATA:DEL command to delete the waveform in
volatile memory or any of the four user-defined waveforms in non-
volatile memory. Use the DATA:CAT? command to list all waveforms
currently stored in volatile and non-volatile memory (as well as the
five built-in waveforms).
• After downloading the waveform data to memory, use the FUNC:USER
command to choose the active waveform and the
FUNC USER
command
to output it.
• To download binary data over the RS-232 interface, you can use any
handshake mode except XON/XOFF and be sure to select “Parity None
”
(8 data bits). You must also insert a pause of approximately 1 ms
between sending the header and sending the binary block.
See page 219 for more information on configuring the RS-232 interface
.
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