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224 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Creating and Downloading Waveform Files
Loading, Playing, and Verifying a Downloaded Waveform
Loading, Playing, and Verifying a Downloaded Waveform
The following procedures show how to perform the steps using SCPI commands. For front panel key
commands, refer to the User’s Guide or to the Key help in the signal generator.
Loading a File from Non-Volatile Memory
Select the downloaded I/Q file in non-volatile waveform memory (NVWFM) and load it into volatile
waveform memory (WFM1). The file comprises three items: I/Q data, marker file, and file header
information.
Send one of the following SCPI command to copy the I/Q file, marker file and file header
information:
:MEMory:COPY:NAME "<NVWFM:file_name>","<WFM1:file_name>"
:MEMory:COPY:NAME "<NVMKR:file_name>","<MKR1:file_name>"
:MEMory:COPY:NAME "<,"<HDR:file_name>"
15 Send the generated waveform data stored in the I/Q array (iqbuffer) to the signal generator.
• iwrite() sends the data specified in iqbuffer to the signal generator (session identifier specified in id).
• The third argument of iwrite(), bytesToSend, contains the length of the iqbuffer in bytes. In this example,
it is 2000.
• The fourth argument of iwrite(), 0, means there is no END of file indicator in the data.
In many programming languages, there are two methods to send SCPI commands and data:
— Method 1 where the program stops the data download when it encounters the first zero (END
indicator) in the data.
— Method 2 where the program sends a fixed number of bytes and ignores any zeros in the data. This
is the method used in our program.
For your programming language, you must find and use the equivalent of method two. Otherwise you may
only achieve a partial download of the I and Q data.
16 Send the terminating carriage (\n) as the last byte of the waveform data.
• iwrite() writes the data “\n” to the signal generator (session identifier specified in id).
• The third argument of iwrite(), 1, sends one byte to the signal generator.
• The fourth argument of iwrite(), 1, is the END of file indicator, which the program uses to terminate the
data download.
To verify the waveform data download, see “Loading, Playing, and Verifying a Downloaded Waveform” on
page 224.
Line Code Description—Download the I/Q data