Agilent Technologies 4294A, Руководство по программированию

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Chapter 8 115
Saving/Recalling a Measurement Result/Measurement Setup
Sample Program for Save/Recall
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Sample Program for Save/Recall
Example 8-1 shows a sample program to save a file. This program is stored on the sample
program disk as the file_sav.bas file.
This program sets the save destination mass storage to the flash disk and saves data the user
specified using a user specified filename.
Lines 40 to 80 Identifies the external controller and Instrument BASIC and sets the
GPIB address.
Line 100 Sets the mass storage to the flash disk.
Line 110 Uses the Inp_file_name subprogram to obtain a user-entered save
filename and stores it in the File$ variable.
Line 130 Allows the user to return to the entry start line and enter the data again,
if an error occurs when selecting the contents of a file due to, for
example, a typing error.
Lines 150 to 200 Displays the list of save items (and file formats) and prompts the user
to enter the desired number (1 to 4).
Line 210 Converts the entered value to an integer and substitutes it into the
Content variable.
Line 220 If the value of Content is not an integer between 1 and 4, returns to the
entry start line.
Lines 250 to 500 Depending on the value of Content, substitutes the extension and the
save command name into the Extension$ variable and the Command$
variable, respectively. If the value of Content is 2 or 3, uses the
Select_array subprogram to select the saved internal data array.
Line 530 Clears the error queue.
Line 540 Creates a program message to execute the save from the Command$
and File$ variables and sends it to the 4294A.
Lines 550 to 560 Checks for the occurrence of an error.
Lines 580 to 600 If an error of the -257 error number has occurred (error when a
filename has a problem, for example, when a file having the same
name exists), prompts the user to select from “Change File Name”,
“Purge File”, or “End.”
Lines 610 to 630 If “Change File Name” is selected, uses the Inp_file_name
subprogram again to obtain the user-entered save filename, and returns
to the save start line.
Lines 650 to 670 If “Purge File” is selected, deletes the existing file having the same
filename, and returns to the save start line.
Line 690 Displays the “Save Not Complete” message.
Lines 710 to 720 If an error of the -257 error number has not occurred, displays the
“Save Complete” message and the save filename.
The Inp_file_name subprogram in lines 790 to 910, used to enter a save filename, is
described below.