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cmd err

Question asked by dooleysm on Jul 17, 2007
Latest reply on Jul 17, 2007 by Steve_Ashby

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I'm connecting to an E4448A Spectrum Analyzer using the USB-GPIB connector. I am coding in Visual Studio 2005 C++. I can open a connection to the device successfully, but any time I send an SCPI command I see "CMD ERR, <expression>" (where <expression> is an element in the command string I send) at the bottom of the E4448A's display screen. There doesn't appear to be an error according to my code.

What is this error all about? I haven't found any documentation about this yet, although I'm still looking.

Thanks,
shawn

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Steve_Ashby Jul 17, 2007 11:39 AM
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Are you possibly running in a compatibility mode? Check if you have something other than SCPI selected in the SYSTEM->Config I/O menu on the bottom soft key.
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dooleysm Jul 17, 2007 12:04 PM
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Steve,

Thank you! I've been looking at this for the better part of a day now, trying to figure this out. The *RST command was working so I never thought that it was a configuration issue. I guess the *RST command is not a SCPI thing though?

Anyway, thank you!

shawn
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Steve_Ashby Jul 17, 2007 4:11 PM
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There are a few SCPI commands that are supported even if you are in another instrument language - *IDN? and *RST are two of them. The manual for the compatibility mode is at

http://cp.literature.agilent.com/litweb ... -90316.pdf

and page 50 describes these. Of course, if you realized you were in compatibility mode to look for the manual, it wouldn't have been an issue!

Steve
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