Keysight Technologies X-Series, Руководство по программированию

Страница: 338 / 398

338 Keysight CXG, EXG, and MXG X-Series Signal Generators Programming Guide
Creating and Downloading User–Data Files
User File Data (Bit/Binary) Downloads
Commands for Bit File Downloads
Because the signal generator adds a 10–byte file header during a bit file
download, you must use the SCPI command shown in Table 6-7 . If you FTP or
copy the file for the initial download, the signal generator does not add the 10–
byte file header, and it does recognize the data in the file (no data in the
transmitted signal).
Bit files enable you to control how many bits in the file the signal generator
modulates onto the signal. Even with this file type, the signal generator
requires that all data be contained within bytes. For more information on bit
files, see “Bit File Type Data” on page 328 .
Command Syntax Example
The following command downloads a file that contains 17 bytes:
:MEM:DATA:BIT "new_file",131,#21702%S!4&07#8g*Y9@7
Since this command is file specific (
BIT
), there is no need to add the file
path to the file name.
After execution of this command, the signal generator creates a file in the
bit directory (memory catalog) named “new_file” that contains 27 bytes.
Remember that the signal generator adds a 10–byte file header to a bit file.
When the signal generator uses this file, it will recognize only 131 of the
136 bits (17 bytes) contained in the file.
For information on downloading block data, see
“Downloading User Files”
on page 334 .
Table 6-7 Bit File Type SCPI Commands
Type Command Syntax
Command
:MEM:DATA:BIT <"file_name">,<bit_count>,<block_data>
This downloads the file to the signal generator.
Query
:MEM:DATA:BIT? <"file_name
">
Within the context of a program this query extracts the user file data. Executing the query in a
command window causes it to return the following information:
<bit_count>,<block_data>
.
Query
:MEM:CAT:BIT?
This lists all of the files in the bit file directory and shows the remaining non–volatile memory:
<bytes used by bit files>,<available non-volatile
memory>,<"file_names">