Command for Bit File Downloads

Creating and Downloading User-Data Files

User File Data (Bit/Binary) Downloads (E4438C and E8267D)

Line	Code Description—Download User File Data

8Send the user file data stored in the array (databuffer) to the signal generator.

•iwrite() sends the data specified in databuffer to the signal generator (session identifier specified in id).

•The third argument of iwrite(), bytesToSend, contains the length of the databuffer 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 user file data.

9Send 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 user file data download, see “Command for Bit File Downloads” on page 299 and “Commands for Binary File Downloads” on page 300.

Because the signal generator adds a 10- byte file header during a bit file download, you must use the SCPI command shown in Table 8- 3. 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 288.

Table 8-3 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.

Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide

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N5183A, N5183A MXG, E8663B, N5181A/82A specifications

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Agilent Technologies N5181A/82A manual Command for Bit File Downloads, Bit File Type Scpi Commands

Models: N5183A N5183A MXG E8663B N5181A/82A

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