This occurs when an error is returned from the measuring instrument. With the MX100, you can get the MX100-specific error number.
See the following manual chapters.
Chapter, "MX100 Setting Item Numbers" in the user's manual
Related Products & Solutions
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PC-Based MX100
For test applications with data logging requirements, the MX100 scales from four to 1200 channels. It streams, records, displays, and reports with no programming required.