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VSA 89600 software, identify overload

Question asked by tim558 on Apr 9, 2008
Latest reply on Apr 10, 2008 by tim558

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I am trying to use the 89600 VSA API and determine when my DAC is in overload (i.e. when the little OV1 marker appears on the trace)

How do I query the device to get this data??

I have come across "objTrace.RawDataStatus" in the API reference but have had no luck in decyphering the results.

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DaveHornbeck Apr 9, 2008 1:40 PM
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The bits available in this status word can be referenced by the enums described in the helptext.

VsaTrcDataStatus EnumerationDescription
Specifies the trace indicator messages.

Member Description

vsaTrcDatStaOverload Indicates trace contains an ADC overload.

With this information you can create a statement like:
Overload = (objTrace.RawDataStatus And vsaTrcDatStaOverload) <> 0
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tim558 Apr 10, 2008 3:57 AM
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Excellent, thanks!

Code worked straight off, I have to admit I cant quite work out what the "<> 0" did, I understand the AND operator applies binary addittion i.e. a mask to the variable, does the <> do a binary compare operation??

Maybe I should mention I am working with VBA in MS Excel.

Thanks again for your help, for anyone else looking at this for reference here is my final code snippet

VBA Excel 6.0
**********************************************************
    Dim Overload As Boolean
    Dim vsaTrcDatStaOverload As Integer

    ' Get interfaces to major items
    Call EVMHeader
    Set EVM_Meas = EVM_App.Measurement
    Set EVM_Disp = EVM_App.Display

'This is a MASK to reveal the bit state of a flag
    vsaTrcDatStaOverload = 4

'unveil the mask
    Overload = (EVM_Disp.Traces(4).RawDataStatus And vsaTrcDatStaOverload) <> 0
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VSA 89600 software, identify overload

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