This sample program illustrates the use of several VXIplug&play driver utility functions using Microsoft® Visual Basic.
Date: October 2004
Version: 1.0
Language: Microsoft Visual Basic 6
Instruments: Oscilloscopes
OS Requirements: Microsoft Windows® 98 SE, NT® 4.0, ME, 2000, or XP
Additional Software: Agilent IO Libraries M.01.01.04 (or later)
hp548xx VXIplug&play driver Sample #2 for Visual Basic
To try this program sample, paste the code into the Declarations section of a form and then press F5 and click the form.
hp548xx_init
hp548xx_close
hp548xx_reset
hp548xx_revision_query
hp548xx_timeOut
hp548xx_self_test
hp548xx_error_message
hp548xx_error_query
Illustrates the use of several utility functions:
hp548xx_errorQueryDetect
Sets the driver to check the instrument for errors.
hp548xx_cmd
Sends a command string to the instrument. In this Sample, it sends a command which generates an error which then illustrates the use of hp548xx_error_query and hp548xx_error_message (in the vb_err ). It is also used to send a command that clears event status registers.
One of the most interesting things about this Sample is the error detection portion, most of the second half of the program. After trying it out, you might think that setting errorQueryDetect to true is a great idea! In fact, it's not a bad idea for the hp548xx, but beware of the potential performance impact. With errorQueryDetect set on, the instrument is queried at least once, if not several times, for all functions which access the instrument. If your application is sensitive to performance, this might make the application too slow.
One effective strategy is to create and debug your application with errorQueryDetect set on, then remove it and leave it off for production applications.
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